D. Imperialism
Is the correct answer
Answer: A.
Explanation: Many came to the U.S not only was it because the U.S was perceived as the land of opportunity for many, but it was also for a very good price to by land.
Simple interest is interest only calculated by multiplying the principal amount by the interest rate and the number of periods in a loan. However compound interest is interest on interest. It is calculated by multiplying the principal amount by the annual interest rate raised to the number of compound periods.
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Since the electoral college is a college of politicians whose job it is to know everyone and everything, we give them our votes and they vote for who should be the president. Therefore, you don't have to know who the president is, but if you give your vote to the elector then they will give it to who they know is about the ideas that you voted for. Nowadays it is much more complicated due to the scale of it all.