What's the difference between the American and National Baseball Leagues?

Author's Note

I love baseball, especially the Baltimore Orioles. But I'd never thought a lot about the history of the game as we know it. It wasn't as easy as I had thought it would be to find the history. There's a lot of information online about players, statistics, etc., but my search for authoritative information took me to a university library and some books. I was interested to learn of the squabbles between leagues in the early days. Sometimes we think everything used to be pure, and only in contemporary times do we have squabbles over business, money, leadership and so on, but my research showed me that's not the case.

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