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You are extrapolating backwards man.
When Nixon visited China there was no market to speak of, China was mired in Cultural revolution and Deng XiaoPing was in house arrest.
Americans wanted to end the war in SEA but also wanted to withdraw with honour not defeat, also world peace was the main reason US and China had relations normalised.
The purpose of Nixon’s strategic China trip was to have China opening their border to US. It took 10 years to achieve this purpose.
In 1975, South government fell because lack of US Congress support. US had withdrew their troops and completed their Vietnamized Vietnamese War program in 1972.
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1. North Vietnamese people? The U.S. was trying to stop the spread of communism from the North, but at the same time, doing a huge massacre at My Lai. That little incidence broke the trust of the South Vietnamese to the Americans. They cannot win the hearts and minds of South Vietnamese no matter what! Different in culture and custums.
Most South Vietnamese were thankful for US support against the Communists oppression. Just remember, the oppression has come from the North.
In any war, tragedies happened. I don’t blame US troops so much on the massacre of My Lai because of the soldiers’ inexperience and incompetent. But I have always mad when remember the systematic killing of thousands of South Vietnamese at Hue during Tet 1968 offensive by Viet Cong. It’s so cruel and inhuman.
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2. Okay, you agree.
3. The U.S. withdrew slowly until 1972, but was not a good exit plan. What was their reason to withdraw? Troubles at home and trading partners with china. That was a stab in the back at the South Vietnamese government. Or somewhat, they lost faith in the war.
4. 1968 or 1969, doesn't matter. What matters here is that the U.S. suffered more than they could imagine. The only reason they reinforced more troops was to raise the morale of the troops, but that didn't work out as planned.
In 1972, US troops had completed the withdrawal. Saigon gov’t fell in 1975.
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5 & 6. Different timeline you're talking about.
I said “IF.”
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7. They still failed at the horror of guerilla tactics.
No, Viet Cong guerilla had failed. From 1971 to 1975, there were no major terrorist attacks anywhere in Southern Vietnam. Before 1971, Viet Cong guerilla were very successful in employing terrorist tactics like blowing up hotels, placing mines on highways, ambushing supply convoys, etc… Instead of US troops, many Vietnamese were killed as the results.