The United States realized that it could not win a limited engagement war against an enemy which was being heavily resupplied by China. Congress quit appropriating money for the war, and public opinion was becoming overwhelmingly anti-war.
Nixon achieved an end to the US involvement in Vietnam by negotiating with North Vietnam. An agreement on a cease fire and withdrawal helped end the US involvement.
By treaty
No.
global war on terrisom
They approved the funding.
Support of the French efforts in Indochina. US involvement in Vietnam began long before the actual Vietnam War.
Containment .
no they did not support it
North Vietnam took over and united the country.
The cold war/communist aggression.
The "Domino Theory".
US Presidents Eisenhower, Kennedy, Johnson and Nixon.