Why did the US lose the Vietnam War?

Could you elaborate on the reasons behind the United States' defeat in the Vietnam War? Was it due to the complexity of the conflict, involving multiple factions and interests? Did the US face challenges in maintaining public support and political will for a prolonged conflict? Or was it the ineffective strategies and tactics employed by the US military, coupled with the resilience and tenacity of the Vietnamese people and their military forces? Was there a lack of understanding of the cultural and historical context of Vietnam that hindered the US's ability to achieve its goals? Exploring these aspects may provide a more comprehensive understanding of why the US ultimately lost the Vietnam War.