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After two centuries (off and on) as a province of the Persian empire, Egypt was conquered by Alexander the Great. After his death in 323 BCE, Egypt passed into the hands of his general, Ptolemy, and his descendants. Under them, Egypt has become the wealthiest and most highly organized of the “Hellenistic” kingdoms.
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The Treaty of Paris was signed in Paris, France on September 3, 1783. This ended the American Revolutionary War, and gave the colonies their independence from Great Britain. They could now form their own government and make their own laws. This freedom was the most important effect of the American Revolution
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The exchange introduced a wide range of new calorically rich staple crops to the Old World—namely potatoes, sweet potatoes, maize, and cassava. The primary benefit of the New World staples was that they could be grown in Old World climates that were unsuitable for the cultivation of Old World staples.
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Simple machines and man power. Egyptians used complex combinations of simple machines such as pulleys and levers to hoist heavy limestone onto each other. Of course, this also required a good deal of physical strength
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