The answer is most likely D. Refused aid to any nation at war. If the U.S. remained neutral, it would not have to worry about going to war/being attacked by a nation at war with another.
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Answer:
It made it hard for trade and communication with other civilizations, but Chinese civilizations grew along the rivers, whose fertile soil made farming easier. In which river valley did China's civilization begin? What made China's river valleys ideal for farming?
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Answer:
It was called the War on Poverty.
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