Flag with the Nguyễn dynasty, 1920�?945 After Vietnam lost Gia Định, the island of Poulo Condor, and three southern provinces to France Together with the Treaty of Saigon involving the Nguyễn dynasty and France in 1862, a lot of resistance movements while in the south refused to acknowledge the treaty https://eduardooakrz.dgbloggers.com/31365732/indicators-on-việt-nam-you-should-know