The key ideas of "The Prince" were about power and how leaders specifically princes could seek to gain power and also how they could go about maintaining power. These ideas helped to influence European rulers and individuals around the world by promoting this particular type of leadership and power seeking.
The Song Dynasty used rockets, which drove off Mongol siege attacks. The Mongol weaponry was pretty standard.
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Freed slaves who wanted land available under the homestead act still faced the challenge of intense racism and segregation--meaning that they faced persecution and violence from whites who were in competition over the land.
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