Arapaho, are a tribe of the Native Americans historically living on the plains of Colorado and Wyoming. They are allies of the Cheyenne tribe and
loosely aligned with Lakota and Dakota.
By the 1850s, Arapaho bands formed two tribes: the Northern Arapaho and Southern Arapaho. Since 1878, the Northern Arapaho have lived with the Eastern Shoshone on the Wind River Reservation in Wyoming and are federally recognized as the Arapaho Tribe of the Wind River Reservation. The Southern Arapaho live with the Southern Cheyenne in Oklahoma. Together, their members are enrolled and federally recognized as Cheyenne and Arapaho tribes.