Nguyen dynasty and North Vietnam

The Nguyễn dynasty (Vietnamese: Nhà Nguyễn, chữ Nôm: 茹阮) was the last Vietnamese dynasty, preceded by the Nguyễn lords and ruling unified Vietnam independently from 1802 until the start of the French protectorate in 1883. Its emperors were members of the House of Nguyễn Phúc. During its existence, the Nguyễn empire expanded into modern-day Southern Vietnam, Cambodia, and Laos through a continuation of the centuries-long Nam tiến and Siamese–Vietnamese wars. With the French conquest of Vietnam, the Nguyễn dynasty was forced to give up sovereignty over parts of Southern Vietnam (Cochinchina) to France in 1862 and 1874, and after 1883 the Nguyễn dynasty only nominally ruled the French protectorates of Annam (Central Vietnam) as well as Tonkin (Northern Vietnam). Backed by Imperial Japan, in 1945 the last Nguyễn emperor Bảo Đại abolished the protectorate treaty with France and proclaimed the Empire of Vietnam for a short time until 25 August 1945.

The Democratic Republic of Vietnam (DRV; Vietnamese: Việt Nam Dân chủ Cộng hòa – VNDCCH) was a country in Southeast Asia from 1945 to 1976, with sovereignty recognized in July 1954, after which it became commonly known as North Vietnam. A member of the communist Eastern Bloc, it opposed the anti-communist, French-associated State of Vietnam and later its successor state the Western-allied Republic of Vietnam (South Vietnam). North Vietnam launched a successful military offensive against South Vietnam in 1975 and was formally reunified with the South the following year to form the Socialist Republic of Vietnam.