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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Newspapers (Wall Street Journal op-eds)
Television (Real Time With Bill Maher, Sean Hannity)
Internet (Breitbart, Infowars)
Magazines (National Enquirer, Texas Monthly)
The process by which the Constitution was approved by the states is known as ratification.
Yes i do drink soft drinks. What are the tests?
I would say that one assumption is the superiority of Europeans over Africans: their belief that somehow they had the right to enslave other people.
This could be connected to their racism (they thought the same of native Americans and there was a discussion whether native Americans have souls) or religious feeling of superiority ("pagans are not the same as Christians"...)