The National League was founded in 1876. The American League was founded in 1901. At first, the two leagues were enemies. The American League 'stole' a lot of players from the National League by offering them more money. After two years, the two leagues made a truce and became friends, so to speak. They decided to stay as two separate leagues instead of merging into one.
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Arizona diamond backs
Boston red socks
new york Yankees
Tampa bay rays
Detroit tigers
Cleavland Indians
Chicago white socks
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seattle mariners
the American League and the National League, lol, unless by league you mean like the MLB, then it would be the MLB and the NPB (japans major leagues)
AL and NL