Why did the USA lose the Vietnam War?

The Americans did not lose purely for military reasons. There were other factors as well.

Write an explanation AND cite a source from the reading that shows the importance of the following six factors:

1. US military tactics in Vietnam- US Military tactics were no match for the Vietcong's Guerrilla Warfare tactics, as Vietcong fighters were good at what they did, and were very motivated, therefore their tactics overpowered those of the US. (Source 36---This source shows a picture of the Viet Cong underground tunnels used for Guerrilla Warfare)

2. The unpopularity of the South Vietnamese regime- Because the Vietnam War was a war based on the support of the people, the support of the South Vietnamese regime would be an extreme factor in the United States' war efforts, but its unpopularity caused a lack of US support. (Source 35---This source says that South Vietnam is trying to preserve its independence from Communist attack---Source 41)

3. The experience of the Viet Cong and the inexperience of the American soldiers- Viet Cong soldiers were well experienced, well motivated, and well determined to do whatever was possible to help the war efforts, and their skills in fighting helped extremely to defeat the unmotivated, inexperienced American soldiers. (Source 43---This source says that the US had inexperienced men fighting the Vietcong's experience guerrillas on their home ground)

4. Domestic opposition to the war in the U.S.- American citizens opposed the war for the most part as they had found out they were being lied to about winning the war, and were unaware of how many innocent civilians were being murdered in Vietnam. On the other hand, Vietnamese civilians were aware of what was going on and why they were fighting, to survive, which caused them to have more support than the US. ("My Lai Massacre" from Vietnam War reading)

5. Chinese and Soviet support for the Viet Cong- The Vietcong lacked the technologies required to have a chance against the US, therefore the Chinese and Soviets supported them severely in order to overpower the US, and the arms, food, and ammunition they supplied the Vietcong helped them to defeat the US in the war. ("Viet Cong and guerrilla tactics" from Vietnam War reading--This section mentions the way the Viet Cong was supplied by China and the Soviet Union)

6. 'But did they really lose?' Summarize the argument put forward in Source 57, and your view on it.

In Source 57, the argument put forward is that the US did not lose the Vietnam war, and that the South Vietnamese had lost. It is being argued that since the US stopped fighting before the Fall of Saigon, it cannot be a US defeat. In my opinion the United States LOST the Vietnam War, because they were being so badly overpowered that they were forced to stop fighting. I feel that because the Vietcong showed many areas of superiority to the US, it was a US defeat.