<Tr> <Td> <P> Origins of American football </P> <Dl> <Dd> Early history of American football </Dd> <Dd> First game </Dd> <Dd> Walter Camp </Dd> <Dd> First pro player </Dd> <Dd> First pro league </Dd> <Dd> Modern history of American football </Dd> </Dl> <P> Close relations: </P> <Dl> <Dd> Medieval football </Dd> <Dd> Old division football </Dd> <Dd> Rugby football </Dd> <Dd> Association football </Dd> <Dd> Canadian football </Dd> </Dl> <P> Black players in professional American football Homosexuality in American football Concussions in American football Rugby union comparison Rugby league comparison Canadian football comparison Pro Football Hall of Fame College Football Hall of Fame Years in American football </P> <Dl> <Dd> NFL season - by - season </Dd> <Dd> College football season - by - season </Dd> <Dd> Glossary of American football </Dd> </Dl> </Td> </Tr> <P> Origins of American football </P> <Dl> <Dd> Early history of American football </Dd> <Dd> First game </Dd> <Dd> Walter Camp </Dd> <Dd> First pro player </Dd> <Dd> First pro league </Dd> <Dd> Modern history of American football </Dd> </Dl> <Dd> Early history of American football </Dd>

Who votes for the pro football hall of fame