Final answer:
The Union War Department began granting equal pay to black soldiers in 1864 during the American Civil War.
Step-by-step explanation:
The Union War Department began to grant equal pay to black soldiers in 1864, during the American Civil War. This decision was prompted by the bravery and significant contributions of black soldiers, who fought for the Union Army. The passage of the Second Confiscation and Militia Acts in July 1862 started the process of allowing African Americans to enlist and receive equal pay.
Learn more about Equal pay for black soldiers during the American Civil War