The world's first motor show opens in Paris, Marie Curie receives her second Nobel Prize, Muhammad Ali fights his last fight, and Bernie Madoff is arrested, all on this day.
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U.S. Army Signal Corps
1941: During World War II, Germany and Italy declare war on the United States, following the Americans' declaration of war on Japan in the wake of the Dec. 7 attack on Pearl Harbor. The United States, in turn, declares war on Germany and Italy.