When did US involvement in the Vietnam War begin?

• A. 1960-1965
• B. 1964-1973
• C. 1965-1972
• D. 1963-1968

Answer: (B)

The correct answer is that U.S. involvement in the Vietnam War began in 1964 and continued until 1973. This period marks significant escalation, as the United States' military presence increased during the Gulf of Tonkin Incident in August 1964, which led to Congress passing the Gulf of Tonkin Resolution, effectively allowing for greater military engagement.

The years highlighted in this option encapsulate the major phases of U.S. military operations, including the significant escalation of troops and combat activities that characterized this era. By the time troop levels had peaked in the late 1960s, the U.S. was deeply entrenched in both combat and support operations in Vietnam. The end of U.S. involvement is generally recognized as occurring with the withdrawal of combat troops in 1973, following the Paris Peace Accords.

The other options do not accurately capture the full scope of U.S. involvement. They either suggest incorrect beginning or ending years for U.S. engagement, failing to account for the critical escalation period in 1964 or the formal conclusion of involvement in 1973.