Examples include the now defunct XFL, the United States Football League, and the proposed All American Football League. Indoor football is played primarily in spring for this same reason.
The IFAF also oversees the American Football World Cup, which is held every four years. Japan won the first two World Cups, held in 1999 and 2003. Team USA, which had not participated in the previous World Cups, won the title in 2007.
Source: Wikipedia > American Football
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