Vietnam (Vietnamese: Việt Nam), officially the Socialist Republic of Vietnam (Vietnamese: Cộng hòa xã hội chủ nghĩa Việt Nam), is the easternmost country on the Indochina Peninsula. With an estimated 94.6 million inhabitants as of 2016, it is the 15th most populous country in the world. Vietnam shares its land borders with China to the north, and Laos and Cambodia to the west. It shares its maritime borders with Thailand through the Gulf of Thailand, and the Philippines, Indonesia and Malaysia through the South China Sea. Its capital city is Hanoi, while its most populous city is Ho Chi Minh City. Archaeological excavations indicate that Vietnam was inhabited as early as the Paleolithic age. Ancient Vietnamese nation was annexed by China in the 2nd century BC, which subsequently made Vietnam a division of China for over a millennium. The first independent monarchy emerged in the 10th century AD, paving the way for successive imperial dynasties as the nation expanded geographically southward until the Indochina Peninsula was colonised by the French in the mid-19th century. Modern Vietnam's age was marked upon the declaration of independence from France in 1945. Following Vietnamese victory against the French in the First Indochina War, which ended in 1954, the nation was divided into two rival states: communist North and anti-communist South. Conflicts intensified in the Vietnam War, which saw extensive US intervention in support of South Vietnam and ended with North Vietnamese victory in 1975. After North and South Vietnam were reunified under a unitary socialist government in 1976, the country became economically and politically isolated until 1986, when the Communist Party initiated a series of economic and political reforms that facilitated Vietnamese integration into the world politics and economy. As a result of the successful reforms, Vietnam has enjoyed a high GDP growth rate, consistently ranked among the fastest-growing countries in the world, although it faces challenges of issues including poverty, corruption and inadequate social welfare. By 2010, Vietnam had established diplomatic relations with 178 countries. It is a member of the UN, ASEAN, APEC, WTO and the Organisation Internationale de la Francophonie (OIF).