The American Agression was only a setback for Vietnam, their history and mindset is a little longer then just a couple hundred years. BC they were part of China, their capital moved a couple times between Hanoi and Hue leveling the other capital upon exit.
Won/ Outlasted.... You say Po tai to I say Po tah to.
They are now the largest buyer of commercial HVAC in that part of the world outside China. Daikin loves them.
Now agent Orange another chemical dropped from the sky did have some long term effects which were pointed out up in the hill country around Dalat.