A. The wagon trail that settlers followed across Indian and Oklahoma Territories during the 19th century.
B. The route of the old cattle drives that crossed the Oklahoma panhandle between Texas and Dodge City, Kansas.
C. The stretch of I-35 between Norman and the Cotton Bowl Stadium in Dallas when the University of Oklahoma football team plays the University of Texas.
D. The forced relocation of the Choctaws in 1831 and the Cherokees in 1838 from the southeastern United States.