^AFL

The AFL, or American Football League, was a football league that was separate but in competition with the NFL from 1960 to 1969.  The Dallas Texans, who later became the Kansas City Chiefs were members of the AFL.  After the Texans moved to Kansas City and became the Chiefs, they defeated the Minnesota Vikings in Superbowl IV.

The following year the AFL became an official part of the NFL, entering the NFL as the "AFC".  The AFC that exists today in the NFL is comprised of the teams that were once a part of the AFL.  The Chiefs are members and current champions of the AFC West division.