<span> René Descartes</span> was the leader of the Scientific Revolution in France, which developed the mathematical system of Cartesian coordinates.
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From 1861 to 1900, the Civil War fostered a great deal of economic change in the United States. During this period, the economic change most fostered by the Civil War included (1) an end to slavery; (2) an increase in the need for cheap labor to work in the factories; and (3) an increase in railroad building.
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number 3 I hope this helps
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smiling
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The most important immigrant processing center which was found in New York City after the 1890's was Ellis Island.
