What were some factors that made the Vietnam eat such a difficult war to fight for American soldiers and why did America struggle to gain support of the people south Vietnam

The Vietnam War was a military conflict during the Cold War that took place in Vietnam, Laos, and Cambodia from November 1, 1955 until the fall of Saigon on April 30, 1975.  From the perspective of the US government, its role in the conflict was an impediment to South Vietnam's fall to communism and therefore part of a broader US strategy to limit the spread of communism. According to the North Vietnamese government, the war was colonial, first fought by France, with the support of the United States, and then against South Vietnam, which was seen as an American puppet state.

Mainly, the bellicose inconveniences of America in this war were due to the guerrilla war carried out by the Vietnamese, who, thanks to their knowledge of the terrain, managed to complicate American military operations. In addition, the Vietnamese viewed the Americans as foreign invaders, making civilian support for their cause extremely difficult.