The Correct Answer Is:
Popular sovereignty is government based on consent of the people. The government's source of authority is the people, and its power is not legitimate if it disregards the will of the people. Government established by free choice of the people is expected to serve the people, who have sovereignty, or supreme power.
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C) The states required payment of poll tax and/or the passage of literary test to vote
Supporters typically supported the ideas of containment and domino theory.
Vietnam "hawks" or supporters of the war wanted to see Communism defeated. The war with Vietnam provided an opportunity to contain and possibly destroy Communism. They supported an "any means necessary" approach to defeat Vietnamese aggression which pulled us into war.