data-mm-id=”_o2iajywfw”>Super Bowl LIV on Sunday will mark the first time in 50 years — 18,284 days, to be exact — since the Kansas City Chiefs last participated in pro football's ultimate game. Their last appearance (and win) came in Super Bowl IV on January 11, 1970. Since then, the league has undergone a drastic transformation, with new rules, new teams, and old teams popping up in new places.1. The AFL-NFL Merger Hadn't Quite Happened YetThe first four Super Bowls were a World Series-type clash between the champions of the National Football League and the American Football League, dueling for pro football supremacy. The Green Bay Packers had claimed the first two Super Bowls for the NFL, before the New York Jets famously backed up Joe Namath's "guarantee"…