<span>Aristarchus disapproved the belief that Earth is the center of the universe by the by discovering that the earth circles the sun. Eratosthenes disapproved the idea that the earth is flat by discovering that it is round.</span>
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It had many causes, but there were two main issues that split the nation: first was the issue of slavery, and second was the balance of power in the federal government. The South was primarily an agrarian society. The North, and many people in the South, also felt that slavery should be abolished for moral reasons.
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