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The Columbian exchange, also known as the Columbian interchange, named after Christopher Columbus, was the widespread transfer of plants, animals, culture, human populations, technology, diseases, and ideas between the Americas, the Old World, and West Africa in the 15th and 16th centuries. The impact was most severe in the Caribbean, where by 1600 Native American populations on most islands had plummeted by more than 99 percent. Across the Americas, populations fell by 50 percent to 95 percent by 1650. The disease component of the Columbian Exchange was decidedly one-sided.
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Hitler planned to take Stalingrad failed and was forced to go to a defensive, as the Allies took kept advancing and eventually take Berlin.
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The Ptolemaic model of the universe was heliocentric. the Copernican system included uniform circular motion. his years of careful observations of the planets.
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Hope I could help!Stay safe and drink water<3
Originally the United States only had atomic weapons, but that all changed when in 1949 the U.S.S.R (or the Soviet Union) set off an atomic bomb, which started the Nuclear Arms race.
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