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American football - Wikipedia
History of American football - Wikipedia
American football in the United States - Wikipedia
American football | Definition, History, Leagues, Rules, & Facts
American football - Simple English Wikipedia, the free …
American football - Wikiwand
History of American football - Wikiwand
American football in the United States - Wikiwand
American Football History: Timeline & How it started
National Football League (NFL) | History, Teams, & Facts