During the american revolution, why did many african-american slaves fight for the british and against the colonists

The British guaranteed African-American slaves that they would be liberated if they fought on the side of the British during the Revolution.

“destroyers for bases agreement in the destroyers for bases agreement between the united states and the united kingdom on september 2, 1940, fifty caldwell , wickes, and clemson class us navy destroyers were transferred to the toyalbnavy from the united states navy in exchange for land rights on british possessions.” i hope this you .