Reconstruction occurred after the Civil War, lasting from 1865 to 1877.
So the answer is A. Reconstruction.
The Saint Valentine's Day Massacre is the name given to the death of seven people as part of a Prohibition Era conflict between two powerful criminal gangs in Chicago, Illinois, in the summer of 1929: the South Side Italian gang led by Al Capone and the North Side Irish gang led by Bugs Moran
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