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Why was Cincinnati expelled from the National League in 1880?

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Barry Bonds of the San Francisco Giants swings his bat after hitting his record-breaking 756th home run, with the catcher, umpire, and a cheering crowd behind him at AT&T Park. — History of baseball Giants legend Barry Bonds hitting his record-setting 756th career home run, August 7, 2007.

The Cincinnati Red Stockings, a founding member of the National League in 1876, were expelled from the league in 1880 for two primary reasons: the team played games on Sunday and permitted the sale of liquor on the grounds of its ballpark.1