African Americans who fought for the Union Army in the Civil War * A: Refused to serve under white officers
B: Served mainly in relegated roles, and did not engage in battle
C: included the 54th Massachusetts, which suffered heavy casualties at Fort Wagner in 1863
D: Accounted for less than 1% of the total Union enlistments​

C: included the 54th Massachusetts, which suffered heavy casualties at Fort Wagner in 1863

Explanation:

African Americans joined the Union army after the Emancipation Proclamation because they knew that victory over the Confederacy would end slavery. They therefore signed up as much as they could and saw action in several battles including the Second Battle of Fort Wagner.

Even though the Union Army lost this battle, the bravery of the African Americans became legend with one of them even receiving the Medal of Honor. This improved their standing in the army and led to more African Americans being allowed to join the Union Army.

-an amendment is proposed.

-two-thirds of congress must approve.

-thee-quarters of states must approve.

-the proposed amendment becomes law.

hope this