Answer:
D. insisting that the Monroe Doctrine provided a valid justification for intervention.
Explanation:
Monroe Doctrine is the speech by the president of the United States in 1823, James Monroe who declared the foreign policy of the country in the western hemisphere and foreign involvement would not allowed. After the first world war, there was an increasing threat to get support for the neighbors of the U.S against the allies' cause and to restrict this Intervention in these countries would be justified by using Monroe doctrine.
C. Severely damaged the country's air, water, and soil.
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-The stock market crash in 1929.
-Bank Failures
-Reduction in purchasing across the board
-American economic policy with Europe
-Drought Conditions
Take your pick
