In response to the anti-war movement, the U.S. Congress passed the Case -- Church Amendment to prohibit further U.S. military intervention in Vietnam in June 1973 and reduced aid to South Vietnam in August 1974. With U.S. bombing ended, communist logistical preparations could be accelerated. An oil pipeline was built from North Vietnam to Việt Cộng headquarters in Lộc Ninh, about 75 miles northwest of Saigon. (COSVN was moved back to South Vietnam following the Easter Offensive.) The Ho Chi Minh Trail, beginning as a series of treacherous mountain tracks at the start of the war, was upgraded throughout the war, first into a road network driveable by trucks in the dry season, and finally, into paved, all - weather roads that could be used year - round, even during the monsoon. Between the beginning of 1974 and April 1975, with now - excellent roads and no fear of air interdiction, the communists delivered nearly 365,000 tons of war matériel to battlefields, 2.6 times the total for the previous 13 years.
what name is given to the series of roads used by communist forces during the vietnam war
The Ho Chi Minh Trail