Answer:
The Asiento, the official contract for trading in slaves in the vast Spanish territories was a major engine of the Atlantic slave trade. When Spain first enslaved Native Americans on Hispaniola, and then replaced them with captive Africans, it established unfree labor as the basis for colonial mass-production.
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What is it you are asking people to answer. it is not clear at all?
Yes and no. The Korean war had cost many lives for both sides. It was a tug of war between both sides. We push the North all the way back almost completely into China and they pushed us into the Pusan Perimeter. It was our real test to contain Communism. If we didn't enter the war, Korea would've ended up like Vietnam.