The United States began sending troops to Vietnam to support France in the 1950s. Over the next 25 years, the ensuing wars cost the lives of 5 million people and created a series of internal tensions in the United States, such as the Vietnam War protest movement and the military draft. Even though the Vietnam War was considered the only war Americans had ever lost, many Americans believed it was a noble cause. As President Johnson said in 1965: “We have made a national commitment to help South Vietnam defend its independence. To dishonor that commitment, to abandon this brave little nation to its enemies, and the terror that will follow, would be an unforgivable mistake." But was it really a noble cause? I do not believe. There are several reasons why I think it was a shameful undertaking: First, we want South Vietnam to maintain its independence not only for Vietnamese freedom, but we also want South Vietnam to become an obstacle that could stop the spread of communism. . Second, why did our government keep so many secrets public during the war? Because our embassy was occupied by the Viet Cong right after our government said, “America is on the brink of triumph.” Third: do we really know a country 8,000 miles away from us? We know them so well that we are sure they would appreciate our ideology. Fourth, our government had sent a "boy scout" to fight those sophisticated Viet Cong, some of our troops were composed of people who had just graduated from high school. In the 1960s, according to the American government's "domino theory", if Vietnam came under the control of communism, then the entire Southeast Asia would also fall into communism. The Americans have already lost China, we certainly would not allow Southeast Asia to follow in China's footsteps, otherwise we would lose access to Asia's enormous resources and markets. South Vietnam happened to be fighting communism in North Vietnam and we had a promise to protect their freedom. So our government had the opportunity to use South Vietnam as an obstacle to prevent the domino theory from occurring. We started sending troops, money and military advisors to the South Vietnamese government. And we supported Ngo Dinh Diem who became president of Vietnam through a fake poll. Our government knew that Diem was not a good leader, but we still supported him because he was a strong anti-communist.