The congressional act that was tantamount to a declaration of war against North Vietnam was the

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The Gulf of Tonkin Resolution, passed in 1964, authorized the use of military force in Vietnam after an alleged attack on U.S. ships in the Gulf of Tonkin. This resolution effectively gave President Johnson the power to escalate U.S. involvement in the Vietnam War, and marked a significant escalation of U.S. military involvement in Southeast Asia.

The Congressional Act That Was Tantamount to a Declaration of War