Why would slaves pray for a Union victory?​

Ad the Union were the only equal group and not following racism.

Explanation:

During the war, both sides used African Americans for military purposes; in the South as enslaved labor and in the north as wage labor and military volunteers. Over 100,000 formerly enslaved people fought for the Union and over 500,000 fled their plantations for Union lines.

Explanation:

Hope it is helpful for you

it made them more prductive and efficent but with the change of polcies less and les got into the navy