Answer
They were kept from combat roles.
Explanation
During World war 2 which started in the 19th century, African-American units were utilized by the Army to combat the Native Americans during the Wars. The most noted among this group were the Buffalo Soldiers. Many of these men were unofficially allowed to enlist in the Union Army The African-American men registered for the draft, and black women also volunteered in large numbers. While serving in the Army, Army Air Forces, Navy, Marine Corps, and Coast Guard, they experienced discrimination and segregation but met the challenge and persevered.
The answer is C.Tenth Amendment
The answer to this question is tribes
by providing arms and ammunition to Native Americans.
I don't actually know this. But, I think that it was Lincoln. Then the Amenstapation proclamation was created. BTW, I probably spelt Amenstapation wrong.
