What major U.S. action occurred in 1970 to disrupt Viet Cong bases in neighboring countries?

• A. Tet Offensive
• B. Cambodian Campaign
• C. Operation Menu
• D. Paris Peace Accords

Answer: (B)

The question is testing your knowledge of a major cross-border military move in 1970 designed to hit Viet Cong and NVA bases outside Vietnam’s borders. In 1970 the United States, with South Vietnamese forces, carried out the Cambodian Campaign—a ground incursion into Cambodia aimed at disrupting enemy sanctaries and supply lines along the border and near planned attacks into South Vietnam. This represented a shift from earlier covert bombing campaigns to an overt, large-scale effort to strike the bases used by Viet Cong and North Vietnamese forces from neighboring countries.

This action fits the prompt because it was a high-profile, large-scale move specifically in 1970 intended to undermine enemy bases outside Vietnam. The Tet Offensive occurred in 1968, the Paris Peace Accords were signed in 1973, and while there was a bombing campaign against Cambodia (Operation Menu) starting in 1969, the decisive 1970 action described here is the Cambodian Campaign’s ground invasion.