http://www.pwc.k12.nf.ca/coldwar/plain/vietnam.html
Vietnam War
In 1900, Vietnam became a colony of France. This caused the Vietnamese to begin organizing resistance under Ho Chi Minh. After World War 2, Vietnam was returned to the French with help from British and Indian troops. In 1946, another revolution began, again under Ho Chi Minh and this time they won.
In 1963 the new government asked the US for help. They send supplies and troops immediately. This was justified the American people with the explanation of the "domino theory." The domino theory said that if one country or state fell to the communists it would produce a domino effect, leading to the communist takeover of all southeast Asia.There was much suspicion as to whether the domino theory was a valid reason for Americans to become involved or not. In 1967, Americans began bombing North Vietnam to try to end the war. In 1973, the US and north Vietnam signed the Paris peace accords which called for the withdrawal of all American troops, the exchange of all prisoners of war, and consultations between north and south Vietnam regarding general elections.