Christopher Columbus is the explorer who is credited for discovering America. Of course, there were already people living in America at the time who we call Native Americans. There even was a European, Leif Ericsson, who had been to the Americas before. However, it was Columbus' voyage that started the exploration and colonization of the Americas.
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In paragraph C, there is an error in sentence number 1, because it is "studied", not "studyed".
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Fearing Soviet expansion, the United States committed itself to assisting countries whose governments faced overthrow by Communist forces and gave billions of dollars to war-torn Europe to help it rebuild.