What incident in 1964 prompted expanded U.S. involvement and a congressional resolution?

• A. The Tet Offensive
• B. The Paris Peace Talks
• C. The Gulf of Tonkin incident
• D. The Battle of Khe Sanh

Answer: (C)

The incident in the Gulf of Tonkin in 1964 shows how a single maritime confrontation became the spark for broad American escalation in Vietnam through a congressional mandate. After U.S. ships reported attacks by North Vietnamese forces, President Johnson sought statutory authority to respond more forcefully. Congress granted this with the Gulf of Tonkin Resolution, which authorized the president to take all necessary measures to repel armed attacks and to prevent further aggression. That resolution effectively gave the executive branch wide powers to expand U.S. military involvement without a formal declaration of war, paving the way for sustained bombing campaigns and troop commitments. The other events listed occurred later or in different contexts and did not directly trigger a 1964 congressional resolution.