To demonstrate to our allies and the enemy (Cold War) that the US will back up it's policies with force. To stop the spread of communism, as was successfully stopped at the 38th parallel in Korea in 1953. The preservation of the Republic of South Vietnam, from the aggressive Communist North Vietnam.
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During the "COLD WAR"; the Vietnam War was immoral to most people...who believed that war was "immoral" to begin with. Example: During WWII, which was a "clear case" of self defense (the Pearl Harbor Attack), people in the US still protested US involvement in that war. The "...reasons about the Vietnam War", would be the same; war is immoral, for those that choose to believe it. For many people there is NO JUSTIFICATION for war.
The US is not at war Iraq. The US was at war with a nation called North Vietnam.
Like the US Civil War in the 1860s the Vietnam War in the 1960s divided America.
The US is NOT at war with Iraq. The US was at war with North Vietnam.
The United States did get involved in the Vietnam war because of communism in Vietnam.