1. What factors caused Cheyenne and Arapaho homelands to be reduced and relocated to Oklahoma? 2. Name five tribes whose homelands are on the Great Plains. Objective Compare U.S. political maps today with Native American land maps prior to westward expansion. Trace the cession of homelands resulting from U.S. treaties with Native American nations through the perspective of George Bent. Background Intro: Bent’s Fort began as a trading post in the southern plains on Cheyenne and Arapaho homelands during the 1830s. People who visited the post were either from regional Native American tribes or we Duration: 60 Minutes.