Which incident in August 1964 involved alleged attacks on U.S. ships in the Gulf of Tonkin and led to a congressional resolution expanding U.S. involvement in Vietnam?

• A. Tet Offensive
• B. Dien Bien Phu Fall
• C. Gulf of Tonkin Incident/Resolution
• D. Operation Linebacker

Answer: (C)

The event shows how a specific military incident can trigger a broad political action that changes a country’s role in a distant conflict. In August 1964, U.S. Navy ships in the Gulf of Tonkin reported attacks by North Vietnamese forces, which the U.S. government used to argue that North Vietnam was aggressing against the United States. In response, Congress passed the Gulf of Tonkin Resolution, authorizing the president to take all necessary measures to repel armed attacks and to prevent further aggression. This resolution effectively gave the president wide authority to expand U.S. military involvement in Vietnam without a formal declaration of war.

The other events don’t fit this chain of cause and effect. The Tet Offensive happened in 1968 and marked a turning point in public perception, not an incident that led to a broad congressional authorization in 1964. Dien Bien Phu fell in 1954, well before the Tonkin episode, and Operation Linebacker was a 1972 bombing campaign, not the 1964 catalyst.

So, the correct choice ties together the August 1964 Gulf of Tonkin incidents with the subsequent resolution that expanded U.S. involvement in Vietnam.