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The Chinese created things called "Terraces" which were flat areas to help them raise their crops.
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Spanish explorers introduced many new ideas, technologies, animals, plants, and even diseases to the native people in the Americas.
By the given statement in question, Truman wanted to imply that the effect of communism was growing and if it could not be checked by aiding such countries as Greece and Turkey, then it would have far reaching effects. Truman feared that communism would slowly grip these countries in financial trouble and spread to the Latin American countries and the countries in the East at a very fast rate.
C. Americans need to work together to renew the country.
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