Answer:
The Khmer Rouge was a brutal regime that ruled Cambodia, under the leadership of Marxist dictator Pol Pot, from 1975 to 1979.
Explanation:
Because America was founded on a promise of freedom and the citizens of America still love the freedom and don't want communism where the people don't have freedoms.
The answer is: shifting from an agrarian lifestyle to an urban lifestyle.
The answer is thanksgiving.