Slavery in it's most basic sense is where property rights are applied to people, so the black slaves during that time were not paid as they were seen as equal to cattle or livestock.
British Parliament passed the Stamp Act to help replenish their finances after the costly Seven Years' War with France.
Were there any supporting multiple answers? Either way, I think that it would be because <em>t</em><span><em>hey did it while the Soviet Union supported Ethiopia. They also controlled access to the Red Sea</em>. Hope this helps.</span>