Oklahoma was Indian Country and the tribes split, most going with the CONFEDERACY, the other half with the Union.
The way to tell a Union Indian was he had two crossed straight pins in his lapel. They were told to KILL any white man they saw by Union officers.
On the High Plains many of the tribes saw this as a chance to go on the warpath against the Blue Coats!
After the war was over, Oklahoma Indians were forced to give up most of Western Oklahoma. This land was then given to other tribes during their removal.
Cherokee General Stand Watie was the last to dismiss his troops to go home after the war was over.