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B. Copperheads is your answer.
Copperheads is a name of a snake, and the Northerners termed those who supported the south as "Copperheads". A well-known Copperhead is Vanderbilt, who was forced to run away to Canada because of his beliefs that the Confederacy is legal.
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The answer is (B) Copperheads.
Copperheads were a part of the Democratic Party in the Union (during the Civil War) who opposed the war and wanted peace with the Confederates.