Vietnam was begun by Eisenhower, a republican.
Ho Chi Minh had fought like hell to kick out the fascist Japanese during WW2, but he wasn't "conservative" enough for John Foster Dulles, Eisenhower's goon.
Ho Chi Minh also wanted Vietnam's resources for Vietnam's people, not big-money corporations.
So Ho Chi Minh's requests to Eisenhower got ignored, and Ho went to the country that would help him. The Soviets.
We still get these stupid "foreign policy" blunders, the invasion of Iraq was the biggest of all these fuck-ups, leading right to ISIS.