WASHINGTON — It wasn't supposed to go this way.

Although fears of a possible vote by the United Kingdom to leave the European Union had been growing, most U.S. analysts and bankers believed the chances of the "Brexit" push succeeding were unlikely. But after Britain shocked the world by voting Thursday in favor of secession, global markets quickly plunged into turmoil. The value of the British pound plummeted and bank stocks got hammered.

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