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Winston Churchill opens the new headquarters of a Royal Auxiliary Air Force squadron at Croydon in 1948. Central Press/Hulton Archive/Getty Images hide caption

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An empty Senate meeting room, just outside the chamber, is seen Monday in Washington. Only a week remains for Congress to pass a funding bill to avoid a government shutdown. J. Scott Applewhite/AP hide caption

itoggle caption J. Scott Applewhite/AP

A sign hangs in the window of an information booth at the Lincoln Memorial in December 1995, announcing the temporary closure of the attraction due to the government shutdown. Mark Wilson/AP hide caption

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A man pulls out a bag of marijuana to fill a pipe at Hempfest in Seattle on Aug. 16. Thousands packed a waterfront park for the opening of a three-day marijuana festival, an event that is part party, part protest and part victory celebration after the legalization of pot in Washington and Colorado in 2012. Elaine Thompson/AP hide caption

itoggle caption Elaine Thompson/AP

President Obama addresses the nation in a live televised speech from the East Room of the White House on Tuesday. Evan Vucci/Pool/Getty Images hide caption

itoggle caption Evan Vucci/Pool/Getty Images