The one that did not contribute to the spread of the Great Depression in Europe is : C. Europeans invested heavily in railroads
Technically, the railroad building opened a lot of job opportunities for the people and helped during the depression
The answer is C principles that restrict the extent of something.
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The Monroe Doctrine granted the United States the ability to independently intervene in the trading economy. Having the ability to act alone and be neutral to war situations allowed them to make economic decisions based off of what they felt was best for them to prosper.