The Allies of World War II were the countries officially opposed to the Axis Powers during the Second World War. Dates on which independent states joined the Allies: * Poland: 1939, 1 September * Australia: 1939, 3 September * New Zealand: 1939, 3 September * United Kingdom: 1939, 3 September (included Indian Empire & Crown Colonies) * France: 1939, 3 September * Nepal: 1939, 4 September * South Africa: 1939, 6 September * Canada: 1939, 10 September * Norway: 1940, 9 April * Belgium: 1940, 10 May * Luxembourg: 1940, 10 May * Netherlands: 1940, 10 May * Greece: 1940, 28 October * Kingdom of Yugoslavia: 1941, 6 April (formerly a member of the Axis) * Soviet Union: 1941, 22 June * Tannu Tuva: 1941, 25 June (annexed by Soviet Union in 1944) * Panama: 1941, 7 December * Costa Rica: 1941, 8 December * Dominican Republic: 1941, 8 December * El Salvador: 1941, 8 December * Haiti: 1941, 8 December * Honduras: 1941, 8 December * Nicaragua: 1941, 8 December * United States of America: 1941, 8 December (including American Samoa, Guam, the Commonwealth of the Philippines, Puerto Rico, the U.S. Virgin Islands and other unincorporated territories) * Republic of China: 1941, 9 December (in war with Empire of Japan since 1937) * Guatemala: 1941, 9 December * Cuba: 1941, 9 December * Czechoslovakia (Government-in-Exile) : 1941, 16 December * Peru: 1942, 12 February * Mexico: 1942, 22 May * Brazil: 1942, 22 August * Ethiopia: 1942, 14 December * Iraq: 1943, 17 January (occupied by Allies in 1941) * Bolivia: 1943, 7 April * Iran: 1943, 9 September (occupied by Allies in 1941) * Italy: 1943, 13 October (formerly a member of the Axis) * Colombia: 1943, 26 November * Liberia: 1944, 27 January * Romania: 1944, 23 August (formerly a member of the Axis) * Bulgaria: 1944, 8 September (formerly a member of the Axis) * San Marino: 1944, 21 September * Albania: 1944, 26 October (formerly occupied by Fascist Italy) * Hungary: 1945, 20 January (formerly a member of the Axis) * Bahawalpur: 1945, 2 February * Ecuador: 1945, 2 February * Paraguay: 1945, 7 February * Uruguay: 1945, 15 February * Venezuela: 1945, 15 February * Turkey: 1945, 23 February * Lebanon: 1945, 27 February * Saudi Arabia: 1945, 1 March * Finland: 1945, 4 March (formerly an Axis co-belligerent, de facto co-belligerent of UN in Lapland War) * Argentina: 1945, 27 March * Chile: 1945, 11 April * People's Republic of Mongolia: 1945, 9 August Source: http://en.wikipedia.org/wiki/Allies_of_World_War_II