Answer:
The Vietnam War was a long, costly and divisive conflict that pitted the communist government of North Vietnam against South Vietnam and its principal ally, the United States. Gulf of Tonkin Incident. The Gulf of Tonkin Incident, also known as the U.S.S. Maddox incident, marked the formal entry of the United States into the Vietnam War. “In the summer of 1964 the Johnson administration was laying secret plans for an expansion of U.S. military involvement in Vietnam.
Step-by-step explanation:
During the war years, America's leaders insisted that military force was necessary to defend a sovereign nation — South Vietnam — from external Communist aggression. As President Lyndon B. Johnson put it in 1965, “The first reality is that North Vietnam has attacked the independent nation of South Vietnam.