The federation was formed in October 1887, consisted of three Vietnamese regions, Tonkin (North), Annam (Central), and Cochinchina (South), as well as the Kingdom of Cambodia. Laos was added after the Franco-Siamese War in 1893 and Kouang-Tchéou-Wan in 1900. The capital was moved from Saigon to Hanoi in 1902 and again to Da Lat in 1939 until 1945, when it moved back to Hanoi.