The black death. If you're talking about Europe.
Ukraine (USSR)Holocaust and Nazi -Occupied Europe,1941-1955..Rwandan Genocide,Rwanda..1994..Armenian Genocide..1914..Civil Rights issues USA..1960’s..Along with the Jim Crow Laws..
To prevent spread of communism after the end of WWll
In 1800s life in the US was not easy. The lands was big, wild and still mostly untamed. The travel was slow and often wrought with peril as the dangers loomed on the roads, if there were any at all. Most of the Americans, two thirds of them in fact lived near the Atlantic coast and that is within 50 miles of it. Also, west of the Appalachian mounts only one tenth of the Americans lived there.
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