In December 1941 Japan attacked the United States at Pearl Harbor , Hawai'i, causing the U.S. to enter World War II. Over two years would pass until the Allies reached their great turning point in the Pacific War: the defeat of the Japanese at Guadalcanal in February 1943.

D-Day Overview: It is hard to conceive the epic scope of this decisive battle that foreshadowed the end of Hitlers dream of Nazi domination. Overlord was the largest air, land, and sea operation undertaken before or since June 6, 1944. The landing included over 5,000 ships, 11,000 airplanes, and over 150,000 service men.

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World War II , also called Second World War, conflict that involved virtually every part of the world during the years 1939-45. The principal belligerents were the Axis powers-Germany, Italy , and Japan-and the Allies-France, Great Britain, the United States , the Soviet Union, and, to a lesser extent, China .