Quảng Bình Province added phủ Quảng Trạch. Under French colony (French Indochina, Quảng Bình was situated in Annam of French Indochina and Đồng Hới airbase in Quảng Bình was used by the French to attack the Việt Minh in north-central Vietnam and the Laotian Pathet army in north and south Laos. In 1954, the Geneva Accord was signed by France, Vietnam, and other parties involved. According to which, Vietnam was to be temporarily divided into 2 parts, with the 17th parallel as the boundary. North Vietnam was under the control of the Communist party while the South was an anti-communist and French collaborators
1954 Geneva Conference the Berlin Conference, participants agreed that "the problem of restoring peace in Indochina will also be discussed at the Conference [on the Korean question] to which representatives of the United States, France, the United Kingdom, the Union of Soviet Socialist Republics and the Chinese People's Republic and other interested states will be invited." The conference was held at the Palace of Nations in Geneva, commencing on April 26, 1954. The first agenda item was the Korean question to be followed by Indochina. The armistice signed at end of the Korean War required a political conference within three months—a timeline which