Genghis Khan builds an empire; a plague devastates Asia and Europe.
Genghis Khan builds an empire; a plague devastates Asia and Europe; and the gun and printing press are invented.
The discovery of America by Christopher Columbus leads to the downfall of the Aztec empire.
Examining effects of the Civil War and industrial revolution on the American landscape.
Innovative industries emerge after the end of the Civil War; mankind enters the Atomic Age.
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