Vietnam ( ; ), officially the Socialist Republic of Vietnam ( ; ), is the easternmost country on the Indochina Peninsula in Southeast Asia. It is bordered by China to the north, Laos to the northwest, Cambodia to the southwest, and the South China Sea to the east. With a population of over 86 million, Vietnam is the 13th most populous country in the world.

The people of Vietnam regained independence and broke away from China in AD 938 after their victory at the battle of Bạch Đằng River. Successive dynasties flourished along with geographic and political expansion deeper into Southeast Asia, until it was colonized by the French in the mid-19th century. Efforts to resist the French eventually led to their expulsion from the country in the mid-20th century, leaving a nation divided politically into two countries. Fighting between the two sides continued during the Vietnam War, ending with a North Vietnamese victory in 1975.

Emerging from this prolonged military engagement, the war-ravaged nation was politically isolated. The government's centrally planned economic decisions hindered post-war reconstruction and its treatment of the losing side engendered more resentment than reconciliation. In 1986, it instituted economic and political reforms and began a path towards international reintegration. By 2000, it had established diplomatic relations with most nations. Its economic growth had been among the highest in the world in the past decade. These efforts culminated in Vietnam joining the World Trade Organization in 2007 and its successful bid to become a non-permanent member of the United Nations Security Council in 2008.

Etymology

Through the centuries, Vietnam has been called by many different names: Văn Lang during the Hùng Vương Dynasty, Âu Lạc during the An Dương Vương dynasty, Nam Viet during the Trieu Dynasty, Van Xuan during the Anterior Lý Dynasty, Đại Cồ Việt during the Đinh dynasty and Anterior Lê Dynasty. Starting in 1054, Vietnam was called Đại Việt (Great Viet). During the Hồ Dynasty, Vietnam was called Đại Ngu (Hán tự: 太 虞). Then, in 1804, Emperor Gia Long planned to use the name of Nam Việt for Vietnam then changed it to Việt Nam. In English, the two words are usually combined into one word, "Vietnam;" however, "Viet Nam" was historically fairly common, gradually fading out of use during the Vietnam War, and continues to be the official spelling for United Nations use. From 1839 to 1945, Emperor Minh Mạng renamed Việt Nam to Đại Nam (literally "Great South").

The name Việt Nam had been used for this country before it became the official name in "Dư địa chí" of Nguyễn Trãi written in 1435 and perhaps even before. "Việt" is the name of the largest ethnic group in Vietnam: the Kinh (người Kinh) and "Nam" means "the South", affirming Vietnam's sovereignty from China (usually called "North country" by the Vietnamese).