The answer should be the first one : a return to normalcy and isolationism. The reason for this is because they wanted to keep out of foreign affairs from there on out. Obviously that did not work out as well as hoped since Americans were forced into the 2nd World War as well as the Korean and Vietnamese wars. Hope this helps!
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Answer: Mexico
Explanation: Mexico declared independence from Spain on September 16, 1810, 11 years before the other three countries listed
In the factories during this time there were two main levels of power: the workers and the management. The management would often exploit the workers, and this led to the formation of unions.