In the 1860s, aided by the War, " New York " style baseball expanded into a national game, as its first governing body, The National Association of Base Ball Players was formed.

In the 1860s, aided by the War, " New York " style baseball expanded into a national game and the NABBP, as its governing body, expanded into a true national organization, although most of the strongest clubs remained those based in New York City, Brooklyn and Philadelphia.

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