Three factors explained this phenomenon: a birth rate half again as high as Europe’s; a death rate slightly lower; and immigration. All three were linked to the relative abundance of the American economy. The ratio of land to people was much greater than in Europe, making food supply more plentiful and enabling couples to marry earlier and to have more children. Though epidemics frequently ravaged North America, they took a lesser toll in its largely rural environment than among Europe’s denser population. The land/people ratio in the United States raised wages and offered opportunities that
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