Where were most slaves found in the colonies before Revolutionary war ?

in the south

Explanation:

plantations where only in the south and slaves where needed on the plantations therefore in the south

Kinda hard to answer but uh,  there were a half-million Africans resident in the thirteen colonies – and only one-tenth were not enslaved.

Explanation:

Slaves in the Revolutionary War A representation of Lord Dunmore’s Loyalist regiment, many of whom were African-Americans At the outbreak of war with Britain