A United States policy which tried to sustain the spread of communism using many methods. this was because America feared Communism so they used this policy to 'Contain' it...
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I wanna say its D but i'm not fully sure
Answer:
B. The growth of the railroads increased the demand for natural resources.
Explanation:
Railroad transportation changed the way American people traded. For instance, agriculture products were transported easily throughout the country.
