There are 2 leagues. American League and National League.
There are too many to count. There are dozens and dozens of basketball leagues, a few American football leagues, soccer leagues, many baseball leagues, and so on. There is no kept count of professional athletes.
Two leagues: National and American
The Negro leagues were US professional baseball leagues. The term is usually used to include 7 leagues, also called "Negro Major Leagues" which began in 1920.
The American League and the National League
In 1960, both the American and National leagues still had eight teams, and both leagues played 154 game schedules
The Designated hitter is allowed only in the American League and throughout the minor leagues.
30 major League Teams 14 in the American League 16 in the National League
In the Major Leagues there were 16 teams in the 1930, eight in the American League and eight in the National League.
The American League is one of the two leagues in Major League Baseball. There are currently 15 teams in the American League.
The dividing line between the races. In the early years of baseball, there were separate leagues, the Negro Leagues, for the African-American players. Jackie Robinson was the first to play in what is now Major League Baseball.
There were White people who were fans of the Negro leagues. That period in time was feuled with racial so there were many varying outlooks. Baseball has always been a popular American game.
The average lifespan of a baseball player in the major leagues is the same average lifespan of the average North American civilian. 75 years +/- 5 years.
The National League and the American League.
first african american to play baseball in the major leagues
The American League and the National League.
1947. Jackie Robinson was the first African American to play major league baseball