Answer:
In 1862, President Lincoln's Emancipation Proclamation opened the door for African Americans to enlist in the Union Army. Although many had wanted to join the war effort earlier, they were prohibited from enlisting by a federal law dating back to 1792. President Lincoln had also feared that if he authorized their recruitment, border states would secede from the Union. By the end of the war, approximately 180,000 African-American soldiers had joined the fight.
Explanation:
