|Founded||February 2, 1876Manhattan, New Yorkin|
|President||Bill Giles (honorary)|
|No. of teams||15|
|Washington Nationals (1st title)|
|Most titles||Los Angeles Dodgers (23) and San Francisco Giants (23)|
The National League of Professional Baseball Clubs, known simply as the National League (NL), is the older of two leagues constituting Major League Baseball (MLB) in the United States and Canada, and the world's oldest still existing professional team sports league. Founded on February 2, 1876, to replace the National Association of Professional Base Ball Players (NAPBBP) of 1871–1875 (often called simply the "National Association"), the NL is sometimes called the Senior Circuit, in contrast to MLB's other league, the American League, which was founded 25 years later and is called the "Junior Circuit".
Both leagues currently have 15 teams. After two years of conflict in a "baseball war" of 1901–1902, the two eight-team leagues agreed in a "peace pact" to recognize each other as "major leagues", draft rules regarding player contracts, prohibiting "raiding", regulating relationships with minor leagues and lower level clubs, and with each establishing a team in the nation's largest metropolis of New York City, and the league champions of 1903 arranged to compete against each other in the new professional baseball championship tournament with the inaugural "World Series" that Fall of 1903, succeeding earlier similar national series in previous decades since the 1880s. After the 1904 champions failed to reach a similar agreement, the two leagues also formalized the new World Series tournament beginning in 1905 as an arrangement between the leagues themselves. National League teams have won 49 of the 115 World Series championships contested from 1903 to 2019.
By 1875, the National Association of Professional Base Ball Players (NAPBBP, often referred to as the "National Association"), founded four years earlier, was suffering from a lack of strong authority over clubs, unsupervised scheduling, unstable membership of cities, dominance by one team (the Boston Red Stockings), and an extremely low entry fee ($10) that gave clubs no incentive to abide by league rules when it was inconvenient to them.
William A. Hulbert (1832–1882), a Chicago businessman and an officer of the Chicago White Stockings of 1870–1889, approached several NA clubs with the plans for a professional league for the sport of base ball with a stronger central authority and exclusive territories in larger cities only. Additionally, Hulbert had a problem: five of his star players were threatened with expulsion from the NAPBBP because Hulbert had signed them to his club using what were considered questionable means. Hulbert had a great vested interest in creating his own league, and after recruiting St. Louis privately, four western clubs met in Louisville, Kentucky, in January 1876. With Hulbert speaking for the four later in New York City on February 2, 1876, the National League of Professional Base Ball Clubs was established with eight charter members, as follows:
- Chicago ("Chicago White Stockings") according to The Baseball Encyclopedia's retroactive naming convention) from the NA (now the Chicago Cubs, not to be confused with the current Chicago White Sox of the American League)
- Athletic Club of Philadelphia ("Philadelphia Athletics") from the NA (expelled after the 1876 season)
- Boston ("Boston Red Stockings"), the dominant team in the NA (later the Boston Braves, then the Milwaukee Braves, now the Atlanta Braves, not to be confused with the present-day Boston Red Sox of the later American League)
- Hartford ("Hartford Dark Blues") from the NA (folded after the 1877 season)
- Mutual Club of New York ("New York Mutuals") from the NA (expelled after the 1876 season)
- St. Louis ("St. Louis Brown Stockings") from the NA (folded after the 1877 season, having committed to Louisville stars for 1878)
- Cincinnati ("Cincinnati Reds"), a new franchise (disbanded after the 1879 season)
- Louisville ("Louisville Grays"), a new franchise (folded after the 1877 season when four players were banned for gambling)
The National League's formation meant the end of the old National Association after only five seasons, as its remaining clubs shut down or reverted to amateur or minor league status. The only strong club from 1875 excluded in 1876 was a second one in Philadelphia, often called the White Stockings or later Phillies.
The first game in National League history was played on April 22, 1876, at Philadelphia's Jefferson Street Grounds, at 25th & Jefferson Streets, between the Philadelphia Athletics and the Boston baseball club. Boston won the game 6–5.
The new league's authority was soon tested after the first season. The Athletic and Mutual clubs fell behind in the standings and refused to make western road trips late in the season, preferring to play games against local non-league competition to recoup some of their financial losses rather than travel extensively incurring more costs. Hulbert reacted to the clubs' defiance by expelling them, an act which not only shocked baseball followers (New York and Philadelphia were the two most populous cities in the league) and the then sports world, but made it clear to clubs that league schedule commitments, a cornerstone of competition integrity, were not to be ignored.
The National League operated with only six clubs during 1877 and 1878. Over the next several years, various teams joined and left the struggling league. By 1880, six of the eight charter members had folded. The two remaining original NL franchises, Boston and Chicago, remain still in operation today as the Atlanta Braves and the Chicago Cubs. When all eight participants for 1881 returned for 1882—the first off-season without turnover in membership—the "circuit" consisted of a zig-zag line connecting the eight cities: Chicago, Detroit, Cleveland, Buffalo, Troy (near the state capital of Albany, New York), Worcester (Massachusetts), Boston, and Providence.
In 1883, new New York and Philadelphia clubs began National League play. Both teams remain in the NL today, the Phillies in their original city and the New York franchise (later named Giants) now in San Francisco since 1958.
Competition with other leagues
The NL encountered its first strong rival organization when the American Association began play in 1882. The AA played in cities where the NL did not have teams, offered Sunday games and alcoholic beverages in locales where permitted, and sold cheaper tickets everywhere (25 cents versus the NL's standard 50 cents, a hefty sum for many in 1882). The NL struck back by establishing new clubs in 1883 in AA cities Philadelphia (later called "Phillies") and New York (the team that would become the Giants).
The National League and the American Association participated in a version of the World Series seven times during their ten-year coexistence. These contests were less organized than the modern Series, lasting as few as three games and as many as fifteen, with two Series (1885 and 1890) ending in disputed ties. The NL won four times and the AA only once, in 1886.
Starting with the Pittsburgh Pirates in 1887, the National League began to raid the American Association for franchises to replace NL teams that folded. This undercut the stability of the AA.
Other new leagues that rose to compete with the National League were the Union Association and the Players' League. The Union Association was established in 1884 and folded after playing only one season, its league champion St. Louis Maroons joining the NL. The Players' League was established in 1890 by the Brotherhood of Professional Base-Ball Players, the sport's first players' union, which had failed to persuade the NL to modify its labor practices, including a salary cap and a reserve clause that bound players to their teams indefinitely. The NL suffered many defections of star players to the Players' League, but the P.L. collapsed after one season. The Brooklyn, Chicago, Pittsburgh, and New York franchises of the NL absorbed their Players' League counterparts.
The labor strike of 1890 hastened the downfall of the American Association. After the 1891 season, the AA disbanded and merged with the NL, which became known legally for the next decade as the "National League and American Association". The teams now known as the Cincinnati Reds, Los Angeles Dodgers (originally Brooklyn) and Pittsburgh Pirates (as well as the now-defunct Cleveland Spiders) had already switched from the AA to the NL prior to 1892. With the merger, the NL absorbed the St. Louis Browns (now known as the St. Louis Cardinals), along with three other teams that did not survive into the 20th century (for those three teams, see Partnership with the American League below). While four teams that moved from the AA remain in the NL today (Pittsburgh , Cincinnati , Los Angeles [originally Brooklyn; 1890], and St. Louis ), only two original NL franchises (1876) remain in the league: the Chicago Cubs and the Atlanta Braves (originally in Boston, and later Milwaukee). The Cubs are the only charter member to play continuously in the same city. The other two pre-1892 teams still in the league are the Philadelphia Phillies and the San Francisco Giants (originally New York), both of which joined in 1883.
The National League became a 12-team circuit with monopoly status for the rest of the decade. The league became embroiled in numerous internal conflicts, not the least of which was a plan supported by some owners (and bitterly opposed by others) to form a "trust", wherein there would be one common ownership of all twelve teams. The NL used its monopsony power to force a $2,400 limit on annual player wages in 1894.
As the 20th century dawned, the NL was in trouble. Conduct among players was poor, and fistfights were a common sight at games. In addition to fighting each other, they fought with the umpires and often filled the air at games with foul language and obscenities. A game between the Orioles and Boston Beaneaters (a precursor to today's Atlanta Braves) in 1894 ended up having tragic consequences when players became engaged in a brawl and several boys in the stands of the South End Grounds started a fire. The blaze quickly got out of hand and swept through downtown Boston, destroying or damaging 100 buildings. Team owners argued with each other and players hated the NL's $2,400 salary cap. Many teams also ran into trouble with city governments that forbade recreational activities on Sunday.
Billy Sunday, a prominent outfielder in the 1880s, became so disgusted with the behavior of teammates that he quit playing in 1891 to become one of America's most famous evangelical Christian preachers. Most fans appear to have felt the same way, because attendance at games was plummeting by 1900.
Partnership with the American League
After eight seasons as a 12-team league, the NL contracted back to eight teams for the 1900 season, eliminating its teams in Baltimore, Cleveland, Louisville (which has never had another major league team since), and Washington. This provided an opportunity for competition. Three of those cities received franchises in the newly christened American League (AL) when the minor Western League changed its name to the AL in 1900, with the approval of the NL, which regarded the AL as a lesser league since they were a party to the National Agreement. The AL declined to renew its National Agreement membership when it expired the next year, and on January 28, 1901, the AL officially declared itself a second major league in competition with the NL. By 1903, the upstart AL had placed new teams in the National League cities of Boston, Chicago, New York, Philadelphia, and St. Louis, as well as the "abandoned" NL cities Cleveland and Washington (and, temporarily, Baltimore). Only the Cincinnati Reds and Pittsburgh Pirates had no AL team in their markets. The AL among other things enforced a strict conduct policy among its players.
The National League at first refused to recognize the new league, but reality set in as talent and money was split between the two leagues, diluting the league and decreasing financial success. After two years of bitter contention, a new version of the National Agreement was signed in 1903. This meant formal acceptance of each league by the other as an equal partner in major-league baseball, mutual respect of player contracts, and an agreement to play a postseason championship—the World Series.
Major League Baseball narrowly averted radical reorganization in November 1920. Dissatisfied with American League President and National Commission head Ban Johnson, NL owners dissolved the league on November 8 during heated talks on MLB reorganization in the wake of the Black Sox Scandal. Simultaneously, three AL teams also hostile to Johnson (Boston Red Sox, Chicago White Sox, and New York Yankees) withdrew from the AL and joined the eight NL teams in forming a new National League; the 12th team would be whichever of the remaining five AL teams loyal to Johnson first chose to join; if none did so an expansion team would have been placed in Detroit, by far the largest one-team city at that time. Four days later, on November 12, both sides met (without Johnson) and agreed to restore the two leagues and replace the ineffective National Commission with a one-man Commissioner in the person of federal Judge Kenesaw Mountain Landis.
The National League circuit remained unchanged from 1900 through 1952. In 1953 the Braves moved from Boston to Milwaukee; in 1966 they moved again, to Atlanta. In 1958 the Brooklyn Dodgers and the New York Giants moved to Los Angeles and San Francisco, respectively, bringing major league baseball to the West Coast of the U.S. for the first time.
The NL remained an eight-team league for over 60 years. (For the eight teams, see Expansion (1887–1899) above, and "Classic Eight" below.) In 1962—facing competition from the proposed Continental League and confronted by the American League's unilateral expansion in 1961—the NL expanded by adding the New York Mets and the Houston Colt .45s. The "Colts" were renamed the Houston Astros three years later. In 1969, the league added the San Diego Padres and the Montreal Expos (now the Washington Nationals), becoming a 12-team league for the first time since 1899.
In 1969, as a result of its expansion to 12 teams, the National League—which for its first 93 years had competed equally in a single grouping—was reorganized into two divisions of six teams (respectively named the National League East and West, although geographically it was more like North and South), with the division champions meeting in the National League Championship Series (an additional round of postseason competition) for the right to advance to the World Series.
In 1993 the league expanded to 14 teams, adding the Colorado Rockies and the Florida Marlins (which became the Miami Marlins shortly after the end of the 2011 season). In 1998, the Arizona Diamondbacks became the league's fifteenth franchise, and the Milwaukee Brewers moved from the AL to the NL, giving the NL 16 teams for the next 15 seasons.
In 1994, the league was again reorganized, into three geographical divisions (East, West and Central, all currently with five teams; from 1994 to 1997 the West had one less team, and from 1998 to 2012, the Central had one more team). A third postseason round was added at the same time: the three division champions plus a wild card team (the team with the best record among those finishing in second place) now advance to the preliminary National League Division Series. Due to a players' strike, however, the postseason was not actually held in 1994.
Before the 1998 season, the American League and the National League each added a fifteenth team. Because of the odd number of teams, only seven games could possibly be scheduled in each league on any given day. Thus, one team in each league would have to be idle on any given day. This would have made it difficult for scheduling, in terms of travel days and the need to end the season before October. In order for MLB officials to continue primarily intraleague play, both leagues would need to carry an even number of teams, so the decision was made to move one club from the AL Central to the NL Central. Eventually, Milwaukee agreed (after Kansas City declined) to change leagues; the National League now had 16 teams, the American League 14 with the switch.
Designated hitter rule
Often characterized as being a more "traditional" or "pure" league, the National League did not adopt the designated hitter rule that was adopted by the American League in 1973 until 2020. In theory, this meant the role of the manager was greater in the National League than in the American, because the NL manager must take offense into account when making pitching substitutions and vice versa. However, this was disputed by some, such as former Detroit Tigers manager Jim Leyland, who claimed the American League is more difficult because AL managers are required to know exactly when to pull a pitcher, where an NL manager merely pulls his pitcher when that spot comes up in the batting order. Overall, there were fewer home runs and runs scored in the National League than in the American, due to the presence of the pitcher in the NL batting order. From the 1970s until the early 1990s, the use of artificial turf in place of natural grass was far more prevalent in National League ballparks than in the American League. As the collective bargaining agreement came closer to expiring after the 2021 season, owners expressed their intentions to use the designated hitter in all games starting in 2022. In response to the Covid-19 pandemic in 2020, rule changes were instituted in both leagues for the 2020 season, which included an abbreviated 60 game schedule, the use of the designated hitter in all games, and expanded rosters. Discussions continued at that point as to whether the designated hitter would return for 2021.
Permanent interleague play
For the first 96 years of its coexistence with the American League, National League teams faced their AL counterparts only in exhibition games or in the World Series. Beginning in 1997, however, interleague games have been played during the regular season and count in the standings. As part of the agreement instituting interleague play, the American League's designated-hitter rule is used only in games where the American League team is the home team.
In 1999, the offices of American League and National League presidents were discontinued and all authority was vested in the Commissioner's office. The leagues subsequently appointed "honorary" presidents to carry out ceremonial roles such as the awarding of league championship trophies. Additionally, the distinction between AL and NL umpires was erased, and instead all umpires were unified under MLB control. Following these actions, as well as the institution of interleague play, little remains to differentiate between the two leagues.
By 2011, MLB had changed its policy on interleague play, deciding to schedule interleague games throughout the season rather than only during specially designated periods. This policy would allow each league to have 15 teams, with one team in each league playing an interleague game on any given day. As a condition of the sale of the Astros to Jim Crane in November 2011, the team agreed to move to the American League effective with the 2013 season.
Through the end of the 2019 season, the Dodgers and Giants have won the most NL pennants, with 23 each. Representing the National League against the American, the Cardinals have won the most World Series (11) followed by the Giants (8), Dodgers (6), Pirates (5), and Reds (5). St. Louis also holds the distinction of being the only AA club to defeat an NL club in the 19th-century version of the World Series, having done so against their now-division rival Cubs.
Note: Team names are given here according to the convention used by The Baseball Encyclopedia, which regularized them into the familiar form of modern team names. However, most teams in the early period had no name, aside from that of the club (as in "Hartford Base Ball Club" or "Athletic Base Ball Club of Philadelphia"), and nicknames like "Beaneaters," "Perfectos" and the many allusions to uniform colors were inventions by the florid sportswriters of the day.
Charter franchises (1876)
The eight charter teams were the following:
- Athletic Club of Philadelphia from National Association, expelled after 1876 season
- Boston "Red Stockings" or "Red Caps") from National Association (exist today as the Atlanta Braves)
- Chicago "White Stockings" from National Association (exist today as the Chicago Cubs)
- Cincinnati "Red Stockings" new franchise, expelled after 1879 season
- Hartford "Dark Blues" (later the Brooklyn Hartfords) from National Association, folded after 1877 season
- Louisville "Colonels" or "Grays" new franchise, folded after 1877 season
- Mutual Club of New York or "Green Stockings" from National Association, expelled after 1876 season
- St Louis "Brown Stockings" from National Association, folded after 1877 season
Other franchises, 1878–1892
Joined in 1878
- Indianapolis Blues, folded after 1878
- Milwaukee Grays, folded after 1878
- Providence Grays, folded after 1885
Joined in 1879
- Buffalo Bisons, dropped out of the league after 1885
- Forest City of Cleveland, folded after 1884
- Syracuse Stars, folded after 1879
- Troy Trojans, folded after 1882
Joined in 1880
- Cincinnati Stars, dropped from the National League after the season for refusing to sign a pledge to end beer sales in their park.
- Worcester Ruby Legs, folded after 1882
Joined in 1881
- Detroit Wolverines, folded after 1888
Joined in 1883
- New York Gothams (exist today as the San Francisco Giants)
- Philadelphia Quakers (exist today as the Philadelphia Phillies)
Joined in 1885
- St. Louis Maroons, joined from U.A. Relocated to Indianapolis for 1887 season as the Indianapolis Hoosiers, folded after 1889
Joined in 1886
Joined in 1887
- Pittsburgh Alleghenys (exist today as the Pittsburgh Pirates), joined from AA
Joined in 1889
- Cleveland Spiders, joined from AA, folded after 1899
Joined in 1890
- Cincinnati Reds, joined from AA (exist today)
- Brooklyn Grays (exist today as the Los Angeles Dodgers), joined from AA
Joined in 1892
- Baltimore Orioles, joined from AA, contracted after 1899
- Louisville Colonels, joined from AA, contracted after 1899
- St. Louis Browns (exist today as the St. Louis Cardinals), joined from AA
- Washington Senators, joined from AA, contracted after 1899
The eight-team lineup established in 1900 remained unchanged through 1952. All franchises are still in the league, with five remaining in the same city.
- Boston (nicknamed at various times the "Red Stockings,""Red Caps," "Beaneaters" and "Doves," in 1912 named the Boston Braves, then Milwaukee Braves, now the Atlanta Braves)
- Brooklyn (variously labeled the "Bridegrooms," "Grooms," "Superbas," "Robins," "Trolley Dodgers," and "Bums," later called the Brooklyn Dodgers, now the Los Angeles Dodgers)
- Chicago (at first called by reporters the "White Stockings," then "Infants," "Colts," "Orphans," "Remnants" and by 1906 the Chicago Cubs)
- Cincinnati Reds (shortened from early "Red Stockings")
- New York Giants (sometimes "Gothams" and occasionally "Maroons," now the San Francisco Giants. "Giants" was in general press usage as early as the 1885 season and is probably the oldest consistent nickname in baseball, depending on how one categorizes "Phillies")
- Philadelphia Phillies (variously "Quakers" and "Pearls." Their ultimate name was just a shortening of the conventional plural-form "Philadelphias.")
- Pittsburgh (founded in Allegheny, a Pittsburgh suburb, then claimed Pittsburgh as their home city but continued to be referred to as before as "Alleghenys." After "pirating" a player from the Athletics in the Players League collapse in 1890 were tagged "Pirates" in the press.)
- St. Louis (at various times "Brown Stockings," "Browns," "Red Stockings" and "Reds," and today officially the Cardinals and unofficially "Redbirds")
Expansion, relocation, and renaming, 1953–present
- 1953: Boston Braves move to Milwaukee
- 1958: Brooklyn Dodgers move to Los Angeles and New York Giants move to San Francisco
- 1962: Houston Colt .45s and New York Mets enfranchised
- 1965: Houston Colt .45s renamed Astros
- 1966: Milwaukee Braves move to Atlanta
- 1969: Montreal Expos and San Diego Padres enfranchised
- 1993: Colorado Rockies and Florida Marlins enfranchised
- 1998: Arizona Diamondbacks enfranchised
- 1998: Milwaukee Brewers transfer from the American League. (Before the 1998 season, the American League and the National League each added a fifteenth team. Because of the odd number of teams, only seven games could possibly be scheduled in each league on any given day. Thus, one team in each league would have to be idle on any given day, or there would have to be at least one interleague game almost every day. This would have made it difficult for scheduling. To avoid this problem, Milwaukee agreed to change leagues; this gave the National League 16 teams, the American League 14.)
- 2005: Montreal Expos moved by MLB to Washington, D.C., renamed the Washington Nationals
- 2012: Florida Marlins renamed the Miami Marlins
- 2013: Houston Astros moved to the American League West (Interleague play is expanded to occur throughout the season to accommodate each league; both leagues now have fifteen teams each.)
National League East
- Atlanta Braves, the oldest continually operating team in Major League Baseball; enfranchised in 1871 and labeled "Red Stockings" (the club had four key players and the uniform design from the 1869-70 Cincinnati Red Stockings), sometimes "Red Caps," in National Association; joined National League as charter member (1876). Known as "Beaneaters" and other nicknames, as original nickname faded and became re-associated with Cincinnati (and later with the Boston Red Sox). Adopted name "Braves" in 1912. Moved to Milwaukee (1953) and to Atlanta (1966). Prior to the 1994 realignment, the Braves competed in the West division.
- Miami Marlins, enfranchised 1993 as the Florida Marlins, changed name to Miami Marlins (2012).
- New York Mets, enfranchised 1962.
- Philadelphia Phillies, enfranchised 1883 and adopted the Phillies name officially in 1884. The team is the oldest continuous, one-name, one-city franchise in American professional sports history, although the Cubs (who adopted their name after the Phillies' establishment) are older, as are the Braves, who have moved twice.
- Washington Nationals, enfranchised 1969 as the Montreal Expos. Moved to Washington, D.C. (2005).
National League Central
- Chicago Cubs enfranchised 1870 as an independent professional team, chartered into the National Association in 1871, but suspended operations for 1872 and 1873 following the Great Chicago Fire. The team has been continuously active since 1874, making it the oldest continuously active team in its original city in Major League Baseball. It joined the National League as a charter member (1876). Originally called the "Chicago White Stockings" and later the "Chicago Colts" and several other names, the team was first called "Cubs" in 1902.
- Cincinnati Reds enfranchised 1882 in American Association, at first tagged "Red Stockings," joined National League (1890).
- Milwaukee Brewers enfranchised 1969 as the Seattle Pilots in American League, moved to Milwaukee (1970), transferred to National League (1998).
- Pittsburgh Pirates enfranchised 1882 in American Association, joined National League (1887), dubbed "Pirates" for signing Lou Bierbauer away from the Athletics in 1891.
- St. Louis Cardinals enfranchised 1882 in American Association, labeled "Brown Stockings" or just "Browns," joined National League (1892), later "Perfectos," eventually "Cardinals" for their red trim, now often "Redbirds."
National League West
- Arizona Diamondbacks enfranchised 1998
- Colorado Rockies enfranchised 1993
- Los Angeles Dodgers enfranchised 1883 as a minor league team, entered into the American Association as the Brooklyn Atlantics in 1884, soon acquired nickname "Dodgers" (from "trolley dodgers"), joined National League (1890). Also dubbed "Bridegrooms", "Superbas", "Robins" and "Bums" at various times, in addition to "Dodgers". Moved to Los Angeles (1958)
- San Diego Padres enfranchised 1969, sometimes called "Friars" or "Pads."
- San Francisco Giants enfranchised in New York City 1883, nearly half of its original players were members of then just disbanded Troy club, nickname "Giants" in widespread use by 1886, moved to San Francisco (1958)
National League presidents, 1876–1999
- 19th-century National League teams
- List of National League pennant winners
- National League Championship Series (NLCS)
- National League Division Series (NLDS)
- List of National League Wild Card winners
- Major League Baseball
- American League
- World Series
- United Baseball League (proposed)
- Jensen, Mike (October 16, 2008). "'Fantastic feeling' for Bill Giles". Philadelphia Inquirer. Retrieved May 7, 2017.
- "The Almanac – weekly". January 27, 2009. Archived from the original on June 7, 2011. Retrieved February 10, 2009.
- Koppett, Leonard (2004). Koppett's Concise History of Major League Baseball. New York: Carroll & Graf Publishers. p. 141. ISBN 9780786712861.
- For more details, see Milwaukee Brewers#1994–98: Realignment / "We're taking this thing National".
- Mayo, David (May 22, 2011). "Detroit Tigers manager Jim Leyland compares managing in AL and NL". Mlive.com. Retrieved April 1, 2017.
- "The Historical Evolution of the Designated Hitter Rule | Society for American Baseball Research". sabr.org. Retrieved May 19, 2020.
- Brookover, Bob (May 11, 2020) COVID-19 accelerating changes that will be part of baseball forever Philadelphia Inquirer. Retrieved 2020-07-30.
- For more details, see Houston Astros#2012–present: Jim Crane era and move to the American League.
- According to the National League's 1877 Constitution, the member clubs were given as "Boston B. B. Club, Chicago B. B. Club, Cincinnati B. B. Club, Hartford B. B. Club, Louisville B. B. Club, St. Louis B. B. Club." Constitution and Playing Rules of the National League of Professional Base Ball Clubs. Chicago, A. G. Spalding 1877.
- Dewey, Donald & Acocella, Nicholas. The Ball Clubs, p. 28. HarperPerennial, 1996. ISBN 0-06-273403-2.
- United Press. "Once Pirates Were Called Innocents!". The Pittsburgh Press, April 21, 1943, p. 31. Retrieved on May 15, 2013.
- Shaughnessy, Dan. "This Series is fantasy baseball". Sun Journal (Lewiston), October 20, 1999, p. C1. Retrieved on May 15, 2013.
- Boston, like most early teams, had no official name, just nicknames applied by sports reporters, often derived from their uniforms
- "Cubs Timeline".
- "History: Phillies Timeline (1800s)". Philadelphia Phillies. Retrieved July 11, 2010.