 A & M 's archrival was the University of Texas until joining the SEC . In 2004 , sporting events between the Aggies and Longhorns became known as the Lone Star Showdown . The most @-@ watched event in the rivalry was the annual football game held the day of Thanksgiving . Other rivalries have included Texas Tech , Baylor University , and the recently renewed rivalries with the University of Arkansas and Louisiana State University . 
