Why did the U.S. go to war in Vietnam? How did President Johnson escalate the war?

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The United States went to war in Vietnam because it wanted to prevent South Vietnam from falling to the forces of communism.  This was during the Cold War and the United States was very concerned with preventing communism from spreading around the world.  US leaders felt that if Vietnam fell to communism, a “domino effect” would ensue in which all of the other countries of Southeast...

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