What are the reasons against the Vietnam War?

• Main reason of the war is the expansion of Communism.
• The Vietnam communist party known as Vietcong accepted helped from other communist nations.
• Ho Chi Minh the president of North Vietnam was backed by the governments of China, Soviet Union, North Korea.
• The French had colonies and interests in China, and had asked for help from other Eastern European nations.
• The United States entered the war of Vietnam to try to stop the expansion of Communism.

I'd like to start off saying those are the reasons we entered the Vietnam War not reasons against it.

Some Americans felt we had no right to be there. In which case the only real reason we were there was to stop the spread of communism because the presidents during that time believed in what was known as the domino theory. Which meant if one country fell to communism eventually all surrounding countries would. Later it was known that we had no right to have so many troops in Vietnam since there was no declaration of war. Causing the government to win the people's approval by making a new law that you can only have troops in a country for 60 days before pulling them out or declaring war.