Final answer:
President Lyndon Johnson used the Gulf of Tonkin incident to gain support for expanding involvement in Vietnam.
Explanation:
Gulf of Tonkin incident was the event President Lyndon Johnson used to gain congressional support to expand American involvement in Vietnam. This incident involved reported attacks on US warships in the Gulf of Tonkin, leading to the passing of the Gulf of Tonkin Resolution which granted Johnson authority to escalate military operations.
The Tet Offensive, launched by Viet Cong and North Vietnamese forces in 1968, also played a significant role in shaping public opinion about the Vietnam War, leading to increased anti-war sentiment in the United States.
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