During the transitional period, a Provisional Central Government of Vietnam was proclaimed: Nguyễn Văn Xuân, until then head of the Provisional Government of South Vietnam (as Cochinchina had been known since 1947) became its president, while Bảo Đại waited for a complete reunification to take office. However, the Democratic Republic of Vietnam had declared the independence of Vietnam and had control of almost all of Vietnam's territory since September 2, 1945. Besides that, the DRV had also hosted the 1946 Vietnamese National Assembly election with the participation of 89% of Vietnamese voters (north and south). The Democratic Republic of Vietnam had officially become the constitutional representatives of Vietnam in 1946. Since the Halong Bay Agreements resulted in many aspects—excluding the referendum—in the enforcement of the March 6, 1946, Indochinese Independence Convention signed by Communist Hồ Chí Minh's Democratic Republic of Vietnam and High Commissioner of France in Indochina Admiral Thierry d'Argenlieu, representative of Félix Gouin's Provisional French Republic led by the French Section of the Workers' International (SFIO), some regarded the State of Vietnam as a puppet state of the French Fourth Republic. French Union (1949–54) On May 20, 1949, the French National Assembly approved the reunification of Cochinchina with the rest of Vietnam. The decision took effect on June 4 and the State of Vietnam was officially proclaimed on July 2. From 1949 to 1954, after reunification with Cochinchina, the State of Vietnam had partial autonomy from France as an associated state within the French Union. Bảo Đại fought against communist leader Hồ Chí Minh for legitimacy as the legitimate government of Vietnam through the struggle between the Vietnamese National Army and the Việt Minh during the First Indochina War. The State of Vietnam found support in the French Fourth Republic and the United States (1950–1954) while Hồ Chí Minh was backed by the People's Republic of China (since 1950), and to a lesser extent by the Soviet Union. Despite French support, roughly 60% of Vietnamese territory was under Việt Minh control in 1952. Partition (1954–55) After the Geneva Conference of 1954, as well as becoming fully independent with its departure from the French Union, the State of Vietnam became territorially confined to those lands of Vietnam south of the 17th parallel, and as such became commonly known as Republic of Vietnam. Communist forces entered Hanoi on 10 October 1954. The massive semi-voluntary migration of anti-communist north Vietnamese, essentially