Why did south vietnam fall to communism

When the United States was fighting in Vietnam they were only fighting the Vietcong, they rarely far north Vietnam. And the fact of the matter is the United States had moved troops out of Vietnam when Nixon was inaugurated as our president in 1968. Without our troops there, North Vietnam and the Vietcong were able to take over all of Vietnam by 1975.

a

hey man i never said i was right

but im a great guesser

although world war i began in 1914, the united states did not join the war until 1917. the additional firepower, resources, and soldiers of the u.s. to tip the balance of the war in favor of the allies. remaining neutral. when war broke out in 1914, the united states had a policy of neutrality.