Answer:
The factors that led to US involvement in the Vietnam War were primarily political and strategic. The US was concerned about the spread of communism in Southeast Asia and saw Vietnam as a key battleground in the Cold War against the Soviet Union. Additionally, the US had a commitment to support South Vietnam, which was seen as a democratic ally in the region. The Gulf of Tonkin incident in 1964, where US ships were allegedly attacked by North Vietnamese forces, also played a role in escalating US involvement. Finally, the US military-industrial complex, which had grown in the post-World War II era, also played a role in pushing for intervention in Vietnam.