Answer:
They were promised their freedome and felt they would get more rights or also have a free life not being a slave anymore.
Step-by-step explanation:
Many African Americans, both enslaved and free, wanted to join with the Patriots. They believed that they would achieve freedom or expand their civil rights.
The British regular army had some fears that, if armed, blacks would start slave rebellions. Trying to placate southern planters, the British used African Americans as laborers, skilled workers, foragers and spies. Except for those blacks who joined Lord Dunmore's Ethiopian Regiment, only a few blacks, such as Seymour Burr, served in the British army while the fighting was concentrated in the North. It was not until the final months of the war, when manpower was low, that loyalists used blacks to fight for Britain in the South.
Revolutionary leaders began to be fearful of using blacks in the armed forces. They were afraid that slaves who were armed would rise against them. Slave owners became concerned that military service would eventually free their people