Nigel Farage, leader of the U.K. Independence Party, poses after placing a bet that Britain will vote to leave the European Union in Thursday's referendum known as the Brexit. Britain's bookmakers, who have done better than pollsters in recent British ballots, say the odds favor Britain staying in the E.U. Michael Tubi/Corbis via Getty Images hide caption

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President Obama speaks at the SelectUSA Investment Summit in Washington, D.C., on Monday. Concerns about a possible "Brexit" were floating in the air as British investors met with state economic teams at the two-day summit. Pablo Martinez Monsivais/AP hide caption

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Men wearing pro-Brexit T-shirts at an event in London on May 11. Polls show that older voters are more like to vote for the United Kingdom leaving the European Union, while younger voters are more likely to cast ballots to stay in the EU. Bloomberg/Bloomberg via Getty Images hide caption

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Brexit Vote Reveals The Generation Gap In The United Kingdom

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Archaeological conservator Luisa Duarte holds a Roman waxed writing tablet at Bloomberg's London offices on Wednesday. This tablet contains the earliest written reference to London, dated A.D. 65-80; it reads "Londinio Mogontio" --€” that is, "in London, to Mogontius." Daniel Leal-Olivas/AFP/Getty Images hide caption

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Roman Borisovich is a Russian banker-turned-anti-corruption activist and founder of ClampK, the Campaign for Legislation Against Money-laundering in Property by Kleptocrats. Here Borisovich stands in front of a multi-million dollar London house owned by Dmitry Firtash, a Ukrainian billionaire indicted in the U.S. for money-laundering. Lauren Frayer for NPR hide caption

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As The Global Rich Buy Up London Homes, Britons Ask If The Money Is Legit

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"As a farmer," says Will Dickinson, "I want to stay in business." He plans to vote next month to stay in the EU, in part because of the farm subsidies he receives from the European Union. Lauren Frayer/NPR hide caption

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For Some U.K. Farmers, Business Looks Better Without 'Brexit'

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Czech Republic's President Milos Zeman (left) decorates Nicholas Winton with the Czech Republic's highest decoration, The Order of the White Lion, in Prague, on Oct. 28, 2014. Winton, a British citizen who died last year at age 106, saved 669 mostly Jewish children from the Nazis by transporting them out of Prague to Great Britain in 1939. Petr David Josek/AP hide caption

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'Britain's Schindler' Is Remembered By Those He Saved From The Nazis

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Krzystof Przadak, a Polish builder who has lived in Britain for 12 years, at a house he's renovating in a London suburb. Przadak says he now earns 10 times what he did in Poland, but he's uncertain what will happen to him and other Poles in Britain if the U.K. votes to leave the EU on June 23. Lauren Frayer for NPR hide caption

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If Britain Leaves The EU, What Happens To The 'Polish Plumber?'

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Leslie Brent, 90, a retired immunology professor who came to Britain as a Jewish child refugee via Kindertransport in 1938, holds his autobiography, showing a photo of himself and other Kindertransport children. Lauren Frayer/NPR hide caption

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Former Child Refugees, Rescued From Nazis, Urge U.K. To Take Syrian Kids

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The Rock of Gibraltar, as seen from the Spanish town of La Linea de la Concepcion, at Spain's southern tip. Gibraltar has been British territory for 301 years, but many Spaniards want it back. Fresh squabbles over fishing rights cropped up recently. Lauren Frayer/NPR hide caption

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For Tiny Gibraltar, There's A Lot At Stake In The 'Brexit' Vote

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In 1955, British spy Kim Philby denied working for the Soviet Union. Eight years later, he defected to Moscow. He went on to speak to Stasi agents in East German, in an event that was captured on film. Harold Clements/Getty Images hide caption

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Kim Philby Speaking In 1981

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A medal denoting a Commander of the Order of the British Empire (CBE) is seen here at a ceremony last month. Under a new contract, a French company will make some of Britain's medals. John Stillwell/AFP/Getty Images hide caption

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British Prime Minister David Cameron wants to cut migration, and part of the government's plan calls for some foreign workers to leave if they are making less than 35,000 pounds (about $50,000) annually. Ben Pruchnie/Pool/AFP/Getty Images hide caption

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Britain To Foreign Workers: If You Don't Make $50,000 A Year, Please Leave

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