How did the United States respond when North Vietnam attacked a US warship and sent troops to South Vietnam in the early 1960s?

After North Vietnamese attacks on U.S. ships in the Gulf of Tonkin in 1964, Congress passed the Gulf of Tonkin Resolution. It gave President Lyndon B. Johnson authority to take further military action in Vietnam without a formal declaration of war. Therefore, Congress authorized the president to escalate the conflict.

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