Why was it so difficult for us to fight the Vietnam war?

Fighting the Vietnam War was challenging due to a combination of factors, including the difficult terrain and climate, which favored guerrilla tactics used by the Viet Cong and North Vietnamese forces. Additionally, the lack of clear military objectives and understanding of the local culture and politics complicated U.S. strategies. The war also faced significant domestic opposition and protests in the United States, which undermined political support for the conflict. Lastly, Vietnam's historical context of colonialism and nationalism made it difficult for U.S. forces to gain the trust and support of the local population.