Before the modern era of World Series beginning in 1903, a series of championship games called the “World's Championship Series” was played between 1882 and 1891. What is the name of the now defunct league that played against the National League?

Answer American Association

The American Association was an American baseball league that lasted from 1882 to 1891. The National League and the American Association played a series of championship games called the "World's Championship Series" during the years that the American association existed.

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