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 extant 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". Each league has 15 teams.
The National League survived competition from various other professional baseball leagues during the late 19th century. Most did not last for more than a few seasons, with a handful of teams joining the NL once their leagues folded. The American League declared itself a second major league in 1901, and the AL and NL engaged in a "baseball war" during 1901 and 1902 before agreeing to a "peace pact" that recognized each other as legitimate "major leagues". As part of this agreement, the leagues agreed to respect player contracts, establish rules about relationships with minor league clubs, and allow their champions to meet in a "World Series" to decide the overall professional baseball championship. National League teams have won 53 of the 121 World Series championships contested from 1903 to 2025.
For decades, Major League baseball clubs only played teams from their own league during the regular season and most of the playoffs, with only their champions facing off in the World Series. This separation gradually caused the leagues to develop slightly different strategies and styles of play. The National League was long considered the more "traditional" league, a reputation most exemplified by the NL's more prevalent use of "smallball" tactics and lack of a designated hitter rule, which the AL implemented in 1973. However, with the advent of free agency in the 1970s allowing for more player movement between leagues, and the introduction of regular season interleague play in 1997, the difference in play between the two major leagues has diminished considerably. The NL's adoption of the designated hitter rule in , and the expansion of interleague play to 46 games beginning in , has further blurred the lines between leagues.
Though both leagues agreed to be jointly governed by a commissioner in 1920, they remained separate legal and business entities with their own president and management. This was the case until after the 1999 season, when the National League legally merged with the American League under the auspices of Major League Baseball, which has since operated much like other North American professional sports leagues, albeit with two "leagues" instead of "conferences".
History Foundation 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 baseball 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 five 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 Encyclopedias 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 and the sports world (since New York and Philadelphia were the two most populous cities in the league), but made it clear to clubs that league scheduling commitments, a cornerstone of competitive 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.
Expansion (1887–1899) 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—the Baltimore Orioles (not the current MLB team), Louisville Colonels, and Washington Statesmen.
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 $2,400 ($ today) 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 in 1894 ended up having tragic consequences when players became engaged in a brawl and a fire started under the stands of the South End Grounds. The blaze quickly got out of hand and swept through downtown Boston, destroying around 200 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