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General Eisenhower directs the invasions of Sicily and Italy. |
| Iran declars war on Germany and joins the League of Nations. | Oppenheimer organizes the Manhattan Project, a top-secret Weapons Laboratory in Los Alamos, New Mexico. |
| U.S. Army engineers complete the Pentagon building, the largest office building in the world. | |
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The average cost of a new house is $8,011.
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