In 1964, on this day US President Lyndon Baines Johnson delivered his signature foreign policy speech in an address he delivered at the Memorial Hall in Akron University, Ohio:

Akron Address"We are not about to send American boys nine or ten thousand miles away from home to do what Asian boys ought to be doing for themselves.

I told [the Generals] to let Vietnam go the way of China. And then I want 'em to leave me alone, because I've got some bigger things to do right here at home".

In effect Johnson had turned the Truman Doctrine and the Domino Theory on their heads in order to rationalise a non-intervention strategy in Vietnam. Despite tempting provocations such as the Gulf of Tonkin incident, Johnson pursued a domestic agenda and built the "Great Society" through to landslide re-elections in 1964 and 1968.
A transcript of Johnson's speech is described at Bartleby.