Why where so many federal troops placed in western texans after the civil war

Federal troops began entering the state in late May 1865. Their commanders believed that their duty, at least in part, was to ensure loyal government and to protect the rights of the blacks who were free as a result of the war.

Explanation:

Im not sure if this is 100% right, but I'm pretty sure this was the reason. Hope this helps.

d)to gain support for the independence movement.

hope this : )