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The first professional Sport with the league being called the National Association of base ball players.
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In 1875 Harvard played a rugby-styled game with different rules that is arguably the first football game.
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In 1876 MLB or Major League Baseball is founded.
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In 1891 a gym teacher has his students play a game to get out of the rain and it was the start of Basketball.
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Sometime in the late 19th century america recognizes baseball as its national sport.
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8 Olympic games have taken place in America starting in 1904.
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In 1920 the National Football League was created and brought football its proper recognition after about 100 years of unclear rules.
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The National Basketball Association is founded in 1946.
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A Color Line existed in most sports including Baseball until Jackie Robinson broke it in 1947.
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Currently American Football, Baseball, Basketball, Ice Hockey, and Soccer are the most popular sports in America