The Slave Coast is a historical name formerly used for parts of coastal West Africa along the Bight of Benin. The name is derived from the fact that it was a major source of African slaves during the Atlantic slave trade from the early 16th century to the 19th century.
Two of the main reasons for Truman's policy of containment during the Cold War were that the USSR was trying to rapidly expand, and that eliminating communism where it already existed was extremely unlikely. It was considered a very effective policy originally but then was viewed with skepticism when Vietnam hit.
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I'm pretty sure the answer is tenant farmers could use a skill they already had rather than starting over.