The above answer is wrong. Potatoes come from the New World. The correct answer would have to be peaches - all others are indigenous to North America.
The first reason was the Bolshevik Revolution that happened in 1917 and the second major reason was the strikes organized by the workers in the United States. The government was afraid of the chance that communism would take hold in the United States and that is the reason for the raids and prosecution of the individuals who were thought to be anti-American.
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The program that was created as a part of the "Great Society", provides hospital insurance for Americans age 65 or older is Medicare.