With power shifting towards the world’s emerging economies, Britain faces a ‘‘real and present danger’’ if it edges toward the exit of the European Union, its regional alliance of 27 nations, the former British prime minister, Tony Blair, warned Wednesday. Speaking to a business lobby group in London, Blair entered the fraught debate about his country’s place in the union with a speech arguing that the bloc was more important now than ever because it helped Britain leverage its influence within a changed geopolitical landscape.
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