The 19th-century border wars between Missouri and Kansas have continued as a sports rivalry between the University of Missouri and University of Kansas. The rivalry was chiefly expressed through football and basketball games between the two universities, but since Missouri left the Big 12 Conference in 2012, the teams no longer regularly play one another. It was the oldest college rivalry west of the Mississippi River and the second-oldest in the nation. Each year when the universities met to play, the game was coined the "Border War." Following the game, an exchange occurred where the winner took a historic Indian War Drum, which had been passed back and forth for decades. Though Missouri and Kansas no longer have an annual game after the University of Missouri moved to the Southeastern Conference, rivalry still exists between them.