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Baseball is one of America's most enduring sports, evolving from early bat-and-ball games into the professional leagues enjoyed by millions today. Explore the beginnings of baseball, the development of its rules, the rise of professional teams, and the 30 clubs that make up Major League Baseball.
Baseball developed from several earlier bat-and-ball games, including English games such as rounders. These games influenced the forms of baseball played in North America during the 18th and early 19th centuries.
One of the earliest American references appeared in 1791, when Pittsfield, Massachusetts, prohibited playing baseball near its meeting house. By the early 1800s, variations of the game were being played throughout the northeastern United States.
In 1845, the New York Knickerbocker Base Ball Club adopted a written set of rules that helped shape modern baseball. The club included Alexander Cartwright, William Wheaton, and William Tucker.
The rules prohibited putting runners out by striking them with a thrown ball and helped establish more consistent methods of play. Further revisions and standardization during the 1850s contributed to the development of the modern game.
Organized baseball expanded rapidly during the 1840s and 1850s, particularly in New York City, Brooklyn, and nearby communities. Most early clubs consisted of amateur players.
On June 19, 1846, the New York Nine defeated the Knickerbockers at Elysian Fields in Hoboken, New Jersey, in one of the earliest widely documented games played under the Knickerbocker rules. As baseball grew, clubs began adopting increasingly standardized rules.
Professional baseball emerged during the 1860s as clubs began compensating skilled players. In 1869, the Cincinnati Red Stockings became the first widely recognized openly professional baseball team.
The National League was established in 1876, followed by the American League as a major league in 1901. These leagues eventually formed the foundation of today's Major League Baseball, which consists of 30 teams organized into six divisions.
Major League Baseball consists of 30 teams divided equally between the American League and National League. Each league has three divisions: East, Central, and West.
The following table identifies all 30 MLB franchises, their current divisions, and the years commonly associated with their historical franchise origins. Some clubs have changed names, cities, or leagues during their history.
| Division | MLB Team | Franchise Origin |
|---|---|---|
| American League East | New York Yankees | 1901 |
| Boston Red Sox | 1901 | |
| Toronto Blue Jays | 1977 | |
| Baltimore Orioles | 1901 | |
| Tampa Bay Rays | 1998 | |
| American League Central | Chicago White Sox | 1901 |
| Cleveland Guardians | 1901 | |
| Detroit Tigers | 1901 | |
| Kansas City Royals | 1969 | |
| Minnesota Twins | 1901 | |
| American League West | Houston Astros | 1962 |
| Texas Rangers | 1961 | |
| Seattle Mariners | 1977 | |
| Athletics | 1901 | |
| Los Angeles Angels | 1961 | |
| National League East | Atlanta Braves | 1871 |
| New York Mets | 1962 | |
| Philadelphia Phillies | 1883 | |
| Miami Marlins | 1993 | |
| Washington Nationals | 1969 | |
| National League Central | Chicago Cubs | 1876 |
| St. Louis Cardinals | 1882 | |
| Cincinnati Reds | 1882 | |
| Milwaukee Brewers | 1969 | |
| Pittsburgh Pirates | 1882 | |
| National League West | Los Angeles Dodgers | 1883 |
| San Francisco Giants | 1883 | |
| San Diego Padres | 1969 | |
| Arizona Diamondbacks | 1998 | |
| Colorado Rockies | 1993 |
Historical Note: Franchise-origin dates may differ from the first season played under a team's present name or in its current city. The Athletics, for example, began in Philadelphia in 1901, later played in Kansas City and Oakland, and are playing in the Sacramento area during the 2026 season.
From historic baseball rivalries to today's major league matchups, fans can explore tickets to regular-season games, postseason contests, and the World Series.
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