Ngo Dinh Diem presidential visit to the United States became the Senate Majority Leader, while Mansfield—a Democrat from Montana—had been a professor of Asian history before entering politics; as a result his opinions about Vietnam were more influential and held in high regard by his fellow senators. In 1954, the French lost the Battle of Dien Bien Phu and the Geneva Conference was held to determine the future of Indochina. The Viet Minh were given control of North Vietnam, while the State of Vietnam controlled the territory south of the 17th parallel. The Geneva agreements, which the State of Vietnam did not sign, called for reunification elections to be
49th parallel north the 1846 Oregon Treaty. This agreement divided the Oregon Country between British North America and the United States by extending the 49th parallel boundary to the west coast, ending in the Strait of Georgia; it then circumvents Vancouver Island through Boundary Pass, Haro Strait, and the Strait of Juan de Fuca. This had the side effect of isolating Point Roberts, Washington. Although parts of Vancouver Island and parts of Eastern Canada are south of the 49th parallel, and parts of the United States (Alaska, Northwest Angle) are north of it, the term "49th parallel" is sometimes used metonymically to refer