HISTORY

Vietnam's identity has been shaped by long-running conflicts, both internally and with foreign forces. In 111 BC, China's Han dynasty conquered northern Vietnam's Red River Delta and the ancestors of today's Vietnamese. Chinese dynasties ruled Vietnam for the next 1,000 years, inculcating it with Confucian ideas and political culture, but also leaving a tradition of resistance to foreign occupation. In 939 AD, Vietnam achieved independence under a native dynasty. After 1471, when Vietnam conquered the Champa Kingdom in what is now central Vietnam, the Vietnamese moved gradually southward, finally reaching the agriculturally rich Mekong Delta, where they encountered previously settled communities of Cham and Cambodians. As Vietnam's Le dynasty declined, powerful northern and southern families, the Trinh and Nguyen, fought civil wars in the 17th and 18th centuries. A peasant revolt originating in the Tay Son region of central Vietnam defeated both the Nguyen and the Trinh and unified the country at the end of the 18th century, but was itself defeated by a surviving member of the Nguyen family, who founded the Nguyen dynasty as Emperor Gi
Independence: September 2, 1945.a Long in 1802. 
Full Article: http://www.state.gov/r/pa/ei/bgn/4130.htm