Why Did the US Fail to Save South Vietnam from Communism?

The US failed to save the South from Communism due to many interconnected reasons. America did not have the ordinary Vietnamese on their side, and like the French and Japanese before, they were seen as 'foreign occupiers'. Furthermore, America faced much controversy over the war within its own borders, and therefore was fighting a war unpopular to its own people and the people which they tried to 'save'. Militarily the US failed to stop guerrilla warfare and committed many atrocities against the Vietnamese people. Ho Chi Minh (the leader of the North Vietnamese) on the other hand was a person supported by a lot of the Vietnamese (including many in the South), because he gave the people what they wanted, which were to rid the country of foreign occupiers once an for all, and to give the normal person land.
The biggest plausible reason the US's failure to save communism, was because the people were not on their side. …