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The Whigs and the Democrats wanted to keep slavery out of national political discussion in order to prevent what they thought would happen and did happen: a split in the United States with one being slave states only and the other being free states only.
There are three distinct but communicating and interacting geographic regions covered by this term: Crete, the Cyclades and the Greek mainland. Crete is associated with the Minoan civilization from the Early Bronze Age.
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.
Dred Scott would remain a slave and, as a slave, was not a U.S. citizen and was considered property. The Chief Justice of this case, John Marshall, said that Scott shouldn't have even brought his case to court because he is a slave.