The effect that is described as discrepancy between candidates' high poll ratings and election performance, caused by supporters' assumption that an easy win means they need not turn out is called BOOMERANG EFFECT.
The transition from an economy based on agriculture to one based on manufacturing
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The Louisiana Purchase Was Driven by a Slave Rebellion. Napoleon was eager to sell—but the purchase would end up expanding slavery in the U.S. Slaves revolting against French power in Haiti. ... But the purchase was also fueled by a slave revolt in Haiti—and tragically, it ended up expanding slavery in the United States.
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