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led to a major
During the Agricultural Revolution, the introduction of new agricultural tools and
increase in farm production in England. The increase in food production led to
However, the higher efficiency of production also resulted in
also resulted in
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porter is writing economic history because he is focusing on the cost of developing vaccines.

on april 6, 1917, the u.s. joined its allies--britain, france, and russia--to fight in world war i. under the command of major general john j. pershing, more than 2 million u.s. soldiers fought on battlefields in france.

the passage of a strict fugitive slave law