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Thomas Jefferson drew on the ideas of english philosopher John Locke
It was the Spanish conquistador Pizarro who gained control of the Inca Empire, which was in what is now present-day Peru in South America. The Spanish were in search of gold and riches.
I am confused about your question, because neither Truman or Eisenhower were around when Vietnam was happening...
If you clarify, I might be able to answer your question