They approved the funding.
1955.
No.
Containment .
President Eisenhower sent US Military Advisers to South Vietnam in 1955.
Australia was an ally of the US and sent troops to fight in both WWII and Vietnam.
The United States only committed large numbers of American troops in Vietnam.
{| |- | The US involvement in Vietnam began in the 60's. The French had been involved in the war for a long time. Vietnam War went forward for a decade. |}
1. From a guerrilla war to a conventional war. 2. From war in only South Vietnam to open warfare against North Vietnam.
People didn't like conscription.
Johnson
The north wanted the US out, the south wanted the US to stay.
The fear of being invaded was not a justification for the increase in US involvement in Vietnam. The US withdrew from Vietnam in 1975.