The statement about how Karl Marx and Adam Smith are different would be:
Adam Smith and Karl Marx are polar opposites in the political-economic, in such that Smith would in no way agree<span> with a revolution of the proletariat.
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They could not vote or hold government office.
The first and the last indicate it's a reliable source.
U.S. foreign policy shifted away from "isolationism" to international involvement, since the US started to steer away from Washington's idea that it should remain as detached from foreign issues as possible.