Why did the Cherokee, Choctaw, Chickasaw, Seminole, Catawba, and Creek native American tribes fight for the Confederacy during the U.S. Civil War?

by Okay_Splenda_Monkey

Do any primary historical sources exist which record why these tribes decided to back the Confederacy, in their own words?

Georgy_K_Zhukov

This older answer of mine covers a lot of this, so I would expect to be of interest for you.