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It wasn't invented it was founded silly... but it originated from the a.f.l. The american football league. in 1920 first team was the San Francisco 49 .they played college teams in playoffs,only them.and their whole team was Negroes so it made them special to the a.f.l and soon after more teams came to the a.f.l, too many to for one league. So they put some teams into the n.f.l.and some in the a.f.l and now american football league is now arena football league. enjoy the knowledge!!
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