The 5 civilized tribes

Slavery also started slavery in the West (present day Oklahoma). The five civilized tribes were the Cherokees, Creeks, Choctaws, Chickasaws, and seminoles. Most of the people in these tribes sided with the Confderacy. Some tribes, especially the cherokees, sided with the confederacy because they themselves owned slaves and therefore felt they had a common cause to fight for. The confederate government agreed to take over federal payments to the tribes to secure they're loyalty and in return the confederate government invited Native Americans to send delegates to the Confederate congress. A rival faction of the Cherokees sided with the Union only to be rewarded after the war with a military campaign to heard them onto reservations.