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The Copernican Revolution was the paradigm shift from the Ptolemaic model of the heavens, which described the cosmos as having Earth stationary at the center of the universe, to the heliocentric model with the Sun at the center of the Solar System.
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President James Monroe wrote the Monroe doctrine because fear existed that the European powers might try to restore their postions in Latin America, which had in general already obtained their independence. The message that he was trying to get across : The United States were not to tolerate European Countries to make new colonies or interfere with the new independent countries; likewise, the United States would not get involved with conflicts between European Powers.
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The Vienna summit was a summit meeting held on June 4, 1961, in Vienna, Austria, between President John F. Kennedy of the United States and Premier Nikita Khrushchev of the Soviet Union. The leaders of the two superpowers of the Cold War era discussed numerous issues in the relationship between their countries. ... Between 1945 and 1961, 2.7 million East Germans emigrated from East
