African americans who fought for the union during the civil war were not freed until after the war. were usually led by african american officers. had been recruited in border states. were paid less than white soldiers.

Correct  Were paid less than white soldiers.

Details:

According to a National Archives article on "Black Soldiers in the U.S. Military during the Civil War" -

In 1864, however, the US Congress corrected the problem of unequal pay, and made the measure they passed retroactive, so that black soldiers would receive retroactive wages to compensate for that previous inequality.  

Correct  Were paid less than white soldiers.

D.

he is known for discovering   the fossil of a female hominin australopithecine   known as "lucy" in the afar triangle region of hadar, ethiopia.

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