By one source I found some 26,000 Native American's were involved in the Civil War, fought on both sides, and their resons for involvement were both varied and complex. Some tribes fought in the hope that it would help bring down the cultural barriers between the and the Whiteman. Others fought in the hope that it would better their position in life.
In Indian Tererory the Chickasaws and Choctaws sided with the Confederacy for a variety of reasons, including their slaveholding history, geographic pressure from bordering states, and the U.S. government’s abandonment of their treaty responsibility to protect the Choctaws from invasion.
This should be an interesting journey, please join uu.