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As Mitt Romney accepts the Republican presidential nomination to run against Barack Obama, his first test is to explain how he can revive the American economy and put people back to work — the dominant issue in the election. But Romney also faces a second test — how will he lead the world’s most powerful country on the global stage? In two runs for the presidency, Romney has revealed little about his world view, his grasp of global politics, and the choices he would make as president on the most complex national security agenda in decades.