The Answer to sport worldwide is Soccer, but the biggest fan based team in America is The Dallas Cowboys
Fc Porto has the largest fan base in the world
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The English club Manchester united has the largest fan base in the world, Real Madrid comes second.
Kumasi Asante Kotoko FC from Ghana has d largest fan base in Africa and one of the largest in the world. Since its a traditional club, it can bost of about 7 million home fan base alone.
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The Cowboys
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New York
Washington Redskins seems to have a large female fan base.
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Chicago Fire
Boston Bruins