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Most of the work was done by the Roman soldiers.
people moved from farms to cities
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Isolationism has been a recurrent theme in U.S. history. The term is most often applied to the political atmosphere in the U.S. in the 1930s. The policy or doctrine of isolating one's country from the affairs of other nations by declining to enter into alliances, foreign economic commitments, international agreements, etc., seeking to devote the entire efforts of one's country to its own advancement and remain at peace by avoiding foreign entanglements and responsibilities.
