What role did slavery play in the expansion of the European

What role did slavery play in the expansion of the European economy? Discuss the reasons for using enslaved people to do work in European colonies, how Europeans justified enslaving whole races of people, and the consequences of the Native American and African slave labor for the colonies and for Africa. This should be an essay of a minimum of 4-5 paragraphs in length. Begin with a statement of your thesis or argument. Your thesis will be a one sentence answer to the central question. Be sure to support general statements.