Full-scale war broke out between the Việt Minh and France in late 1946 and the First Indochina War officially began. Realizing that colonialism was coming to an end worldwide, France decided to bring former emperor Bảo Đại back to power, as a political alternative to Ho Chi Minh. A Provisional Central Government was formed in 1948, reuniting Annam and Tonkin, but the complete reunification of Vietnam was delayed for a year because of the problems posed by Cochinchina's legal status. In July 1949, the State of Vietnam was officially proclaimed, as a semi-independent country within the French Union, with Bảo Đại as Head of State. France was finally persuaded to relinquish its colonies in Indochina in 1954 when Viet Minh forces defeated the French at Dien Bien Phu. The 1954 Geneva Conference left Vietnam a divided nation, with Hồ Chí Minh's communist DRV government ruling the North from Hanoi and Ngô Đình Diệm's Republic of Vietnam, supported by the United States, ruling the South from Saigon. Between 1953 and 1956, the North Vietnamese government instituted various agrarian reforms, including "rent reduction" and "land reform", which resulted in significant political oppression. During the land reform, testimony from North Vietnamese witnesses suggested a ratio of one execution for every 160 village residents, which extrapolated nationwide would indicate nearly 100,000 executions. Because the campaign was concentrated mainly in the Red River Delta area, a lower estimate of 50,000 executions became widely accepted by scholars at the time. However, declassified documents from the Vietnamese and Hungarian archives indicate that the number of executions was much lower than reported at the time, although likely greater than 13,500. In the South, Diem went about crushing political and religious opposition, imprisoning or killing of thousands.