The most commonly used phrase describing the growth of the American economy in the 1830s and 1840s was “Cotton<span> Is </span>King<span>.” We think of this slogan today as describing the plantation economy of the slavery states in the Deep South, which led to the creation of “the second Middle Passage.”
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They should mostly ask if a hydroelectric power plant emit less CO2 than a thermal power plant. In global warming, CO2 is one of the elements that causes global warming.