 However, archaeologists suggested the Đông Sơn culture found in Northern Vietnam, Guangxi and Laos was around 700 BC.Vietnam's peculiar geography made it a difficult country to attack, which is why Vietnam under the Hùng kings was for so long an independent and self-contained state.Once Vietnam did succumb to foreign rule, however, it proved unable to escape from it, and for 1,000 years, Vietnam was successively governed by a series of Chinese dynasties