When did Lyndon B. Johnson start a war?

Lyndon B. Johnson escalated U.S. involvement in the Vietnam War after the Gulf of Tonkin incident in August 1964. Following this event, he sought and received Congress's approval for the Gulf of Tonkin Resolution in August 1964, which granted him broad military powers in Vietnam. This marked the beginning of significant American military engagement, leading to a substantial increase in troop deployments and combat operations throughout the 1960s.