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TimeLine of WWII
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1939
| August 23-24 | The Soviet-German Nonaggression Pact is signed in Moscow. |
| August 26 | Hitler postpones the invasion of Poland at the last second after hearing that Britain and Poland have signed a formal alliance. |
| September 1 | Germany invades Poland without a declaration of war, marking the beginning of World War II. |
| September 3 | Britain, France, Australia, and New Zealand declare war on Germany. |
| September 4 | The Royal Air Force (Britain) begins its first attacks on German warships. |
| September 5 | The U.S. announces its neutrality. |
| September 10 | Canada declares war on Germany. |
| September 29 | The Soviet Union and Germany announce their Treaty of Friendship. |
| November 30 | The Russo-Finnish War begins after Soviet threats escalate into an invasion of Finland. |
1940
| February 11 | Germany and the Soviet Union sign a further economic and trade agreement. |
| March 13 | Despite promises by Britain and France to send help, Finland signs the armistice with the Soviet Union. |
| April 9 | Germany invades Denmark and Norway. |
| May 7 | British Prime Minister Neville Chamberlain resigns after support in the House of Commons declines. |
| May 10 | Germany invades Belgium and the Netherlands. Winston Churchill becomes the new British Prime Minister. |
| May 26 | British forces begin to fall back to Dunkirk (France) and soon begin to evacuate. |
| June 4 | German troops storm Dunkirk, capturing the city and the remaining French soldiers. |
| June 10 | Italy declares war on France and Great Britain. |
| June 22 | France signs an armistice with Germany. |
| July 10 | The Battle of Britain begins. |
1941
| January 29 - March 27 | Secret talks between British and American representatives produce the ABC1 conclusion code stating that in the event of war with Germany and Japan, Germany should be defeated first. |
| April 6 | Germany invades Greece and Yugoslavia. |
| April 13 | The USSR and Japan sign a five year Neutrality Agreement. |
| June 22 | Germany invades the Soviet Union. |
| June 26 | Finland declares war on the USSR. |
| September 8 | German troops complete the Leningrad blockade. |
| December 7 | At 0755 hours, the Japanese, led by Admiral Nagumo, begins its attack on Pearl Harbor, the main base of the U.S. Pacific Fleet. |
| December 8 | The U.S. and Britain declare war on Japan. China declares war on Germany, Italy, and Japan. Australia, New Zealand, the Netherlands, the Free French, and Yugoslavia declare war on Japan. |
| December 11 | Germany and Italy declare war on the United States. |
| December 19 | The Selective Service Act is amended requiring all men ages 18-64 to register and those 20-44 liable for military service. |
1942
| February 19 | General Eisenhower is appointed to Chief of the War Plans Division of the U.S. Army General Staff. |
| May 8 | The Americans notch a strategic victory after forcing the Japanese to abandon their attack on Port Moresby. |
| June 5-7 | The Americans successfully defeat the Japanese in the Battle of Midway. |
| August 7 | U.S. Marines land on Guadalcanal. |
| August 25 | Hitler gives orders to capture Stalingrad. |
| October 7 | Britain and the United States announce that a United Nations Commission is to be setup to investigate the Axis war crimes. |
| October 23 | Britain attacks the Axis powers at El Alamein in Egypt. |
| November 8 | Allied troops land in Algeria and Morocco. |
1943
| February 2 | The last Germans surrender at Stalingrad. |
| February 18 | The Sixth Army of America becomes operational and is led by General Walter Krueger. |
| April 18 | Admiral Isoroku Yamamoto, the Commander of the Japanese Combined Fleet, is killed when his plane is shot down by Lightning fighters. |
| May 12-25 | Churchill meets Roosevelt in Washington for the Trident Conference which discusses the cross-Channel invasion called D-Day. |
| May 13 | Axis forces in northern Africa surrender. |
| July 4 | Germany opens an assault near Kursk (Soviet Union). |
| July 10 | Allied forces invade Sicily. |
| July 16 | Roosevelt and Churchill issue a statement calling for an Italian surrender. |
| July 25 | Mussolini is relieved of his command by the king and is arrested. Marshal Badoglio takes over for Mussolini. |
| September 3 | Italy secretly surrenders to the Allies. |
| September 9 | Allied troops land at Salerno (Italy). |
| November 20 | U.S. forces invade Tarawa. |
| November 30 | General Alexander Vandegrift is appointed commandant of the U.S. Marine Corps as of January 1, 1944. |
| December 24-29 | Announcements in London and Washington reveal that General Dwight Eisenhower is to be the Supreme Allied Commander for the D-Day Invasion. Admiral Sir Bertram Ramsay and Air Marshal Leigh Mallory will lead the air and naval forces. |
1944
| January 8-11 | Mussolini tries and convicts many members of the Fascist Grand Council. Afterwards, he executes those who were convicted. |
| January 11 | Roosevelt asks Congress for a national service law to prevent strikes and fully use the whole of America's workforce in the war effort. |
| April 1-30 | U.S. bombers drop 43,500 tons of bombs on European aircraft factories, meanwhile other Allied Air Forces bomb targets in Belgium, France, Germany, and Belgrade. |
| April 28 | Secretary to the United States Navy, Frank Knox, dies. |
| May 1-31 | The primary efforts for the Allies center around preparations for the Normandy invasion. |
| June 1 | The BBC transmits the first code message warning the French Resistance that the invasion is imminent. |
| June 5 | The second message warning of the invasion is broadcast to the French Resistance. |
| June 6 | D-DAY----> Allied troops land in Normandy to begin the invasion in northern France. |
| June 19-20 | A U.S. naval force defeats the Japanese in the Battle of the Philippine Sea. |
| July 20 | An assassination plot aimed at Hitler fails. |
| July 18 | Japan's Prime Minister Tojo resigns. |
| October 20 | The Allies begin landing in the Philippines. |
| October 23-26 | The Allies defeat Japan's navy in the Battle of Leyte Gulf in the Philippines. |
| December 16 | The Germans strike back at U.S. troops in the Battle of the Bulge. |
1945
| March 16 | U.S. marines capture Iwo Jima. |
| April 30 | Hitler commits suicide in Berlin. |
| May 7 | Germany surrenders unconditionally to the Allies in Reims, France ending World War II in Europe. |
| June 21 | Allied forces capture Okinawa. |
| August 6 | An atomic bomb is dropped on Hiroshima. |
| August 8 | The Soviet Union declares war on Japan. |
| August 9 | An atomic bomb is dropped on Nagasaki. |
| August 14 | Japan agrees to surrender unconditionally. |
| September 2 | Japan signs surrender terms aboard the battleship U.S.S. Missouri in Tokyo Bay. |