White slavers often employed coastal tribes to go inland and round up members of other tribes for shipment as slaves. Much safer to spend a few trinkets and get some else to do the dangerous rounding up work.
Inter tribal hostility and/or warfare and/or slavery existed before white explorers and/or white slave traders first landed on the beaches.
Inter tribal hostility and/or warfare and/or slavery existed before white explorers and/or white slave traders first landed on the beaches.