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National Football League Players Association was created in 1956.
National Hockey League Players' Association was created in 1967-06.
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The Chicago Cubs essentially started in 1876, when they became a charter National League member.
On July 12, 1949, Brooklyn Dodgers teammates Jackie Robinson, Roy Campanella and Don Newcombe represented the National League. Larry Doby of the Cleveland Indians became the first black American League All-Star in the same game.
When Jackie Robinson entered the National League in 1947, the primary owners of the Dodgers were Walter O'Malley, Branch Rickey, and John Smith. O'Malley assumed majority control of the Dodgers in 1950 upon Smith's death.
Jackie Robinson was the first African American major league Baseball player. He was discriminated against by other players, and even his own teammates resented him.
Major League
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18 or 20. In games played where the home team is from the National League, there are 9 players on each team. In games played where the home team is from the American League there are 10 players on each team. This is because the American League allows for a designated hitter, whereas the National League does not.
The Mets entered the National League in 1962.