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On Sept. 1, 1939 Germany invades Poland, which was the start of the war, Japan invaded China on July 7, 1937. Two days later and France and the United Kingdom declare war on Germany.

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On July 10, 1940 , the Germans begin the first in a long series of bombing raids against Great Britain, as the Battle of Britain, which will last three and a half months.

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Germany, Italy and Japan sign the Tripartite Pact.

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Germany, Italy and Japan sign the Tripartite Pact.

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On Sept. 22, 1940 Tripartite Pact, agreement concluded by Germany, Italy, and Japan on September 22, 1940, one year after the start of World War II. It created a defense alliance between the countries and was largely intended to deter the United States from entering the conflict.

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Japan’s naval air force attacks military bases on Oahu, Hawaii.

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Japan’s naval air force attacks military bases on Oahu, Hawaii.

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On Dec. 7, 1941  The Attack on Pearl Harbor was a surprise military strike by the Japanese Navy Air Service upon the United States.

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The United States declares war against Japan.

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The United States declares war against Japan.

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On Dec. 8, 1941 The United States entered World War II as Congress declared war against Imperial Japan, a day after the attack on Pearl Harbor.

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The United States declares war on Germany and Italy.

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The United States declares war on Germany and Italy.

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On Dec. 11, 1941 four days after the Japanese attack on Pearl Harbor and the United States declaration of war against the Japanese Empire, Nazi Germany declared war against the United States.

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On June 4 to 7, 1942 American naval and air forces met the Japanese near Midway Atoll in one of the most decisive naval battles of the war. The Battle of Midway would become a turning point in the naval war in the Pacific, as the Japanese losses sustained there proved irreparable.

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On July 9, 1942 The Allies decided to move next against Italy, hoping an Allied invasion would remove that fascist regime from the war, secure the central Mediterranean and divert German divisions from the northwest coast of France where the Allies planned to attack in the near future.

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On Sept. 8, 1943  announced earlier that day by Gen. Dwight Eisenhower. The surrender came after several weeks of negotiations between the Italian government and the Allies in the wake of Mussolini's removal from power.

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On June 6, 1944  more than 160,000 Allied troops landed along a 50-mile stretch of heavily-fortified French coastline, to fight Nazi Germany on the beaches of Normandy, France.

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On Aug. 25, 1944  On the morning of August 25, the 2nd Armored Division swept clear the western half of Paris while the 4th Infantry Division cleared the eastern part. Paris was liberated.

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On Dec. 16, 1944 The Allies won the Battle of the Bulge, resulting in significantly higher casualties on the German side despite their surprise attack on Allied forces. Losing 120,000 people and military supplies, German forces were dealt an irreparable blow, while Allied forces suffered only 75,000 casualties.

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On Feb. 19, 1945 The Battle of Iwo Jima was a major battle in which the United States Marine Corps and Navy landed on and eventually captured the island of Iwo Jima from the Imperial Japanese Army during World War II.

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The U.S. 3rd Army crosses the Rhine River in Germany.

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The U.S. 3rd Army crosses the Rhine River in Germany.

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On March 22, 1945 the US Third Army carried out four river assaults in late March. The 5th Infantry Division undertook the first crossing the Rhine at Oppenheim, south of Mainz. They crossed without the usual artillery preparation, a maneuver that caught German troops by surprise.

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On April 1, 1945 The Battle of Okinawa, codenamed Operation Iceberg, was a major battle of the Pacific War fought on the island of Okinawa by United States Army and United States Marine Corps forces against the Imperial Japanese Army.

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On April 25, 1945  is the day Soviet and American troops met at the Elbe River, near Torgau in Germany, marking an important step toward the end of World War II in Europe.

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On May 8, 1945 Victory in Europe Day is the day celebrating the formal acceptance by the Allies of World War II of Germany’s unconditional surrender of its armed forces on Tuesday, 8 May 1945, marking the end of World War II in Europe.

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On Aug. 6, 1945 The United States detonated two nuclear weapons over the Japanese cities of Hiroshima and Nagasaki on 6 and 9 August 1945, respectively. The two bombings killed between 129,000 and 226,000 people.

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The U.S. drops an atomic bomb on Nagasaki, Japan.

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The U.S. drops an atomic bomb on Nagasaki, Japan.

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On Aug. 9, 1945, a second atom bomb is dropped by the United States, at Nagasaki, resulting finally in Japan’s unconditional surrender.

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On Sept. 2, 1945 The surrender of Imperial Japan was announced by Japanese Emperor Hirohito on 15 August and formally signed on 2 September 1945, bringing the hostilities of World War II to a close.