Flag of the Nguyễn dynasty, 1920�?945 Right after Vietnam missing Gia Định, the island of Poulo Condor, and a few southern provinces to France While using the Treaty of Saigon in between the Nguyễn dynasty and France in 1862, many resistance actions during the south refused to acknowledge the treaty https://vf55512233.isblog.net/what-does-việt-nam-mean-48243810