What was the most important lesson of the Vietnam War?

the most important lesson is the terrible price paid when America loses a war

Explanation:

The Vietnam War was an example of imperial aggression. According to historian Michael Parenti: “Imperialism is what empires are all about. Imperialism is what empires do,” as “one country brings to bear…economic and military power upon another country in order to expropriate [its] land, labor, natural resources, capital and markets.” Imperialism ultimately enriches the home country’s dominant class. The process involves “unspeakable repression and state terror,” and must rely repeatedly “upon armed coercion and repression.” The ultimate aim of modern U.S. imperialism is “to make the world safe” for multinational corporations. When discussing imperialism, “the prime unit of analysis should be the economic class rather than the nation-state.

Explanation:

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the social contract theory

these acts divided the south into five military districts.