I notice you didn't address certain of my serious questions, out of necessity. Pack up and go home.
I'll end with one question, what were the boundaries of Viet Nam in 1920, versus 1960?
Um.... YOU need to go back and relearn your history. There was NO nation of Vietnam in 1920. What is today Vietnam was part of the French colony of Indochina which also incorporated what is today Laos and Cambodia.