A dream deferred: U.S. President Barack Obama speaking in Prague, April 2009
Peter Josek/REUTERS

On April 5, 2009, U.S. President Barack Obama stood before a massive crowd in Prague and gave a soaring speech announcing his commitment to “a world without nuclear weapons.” In pursuit of that goal, he pledged to seek an arms reduction treaty with Russia, ratify the Comprehensive Nuclear Test Ban Treaty (CTBT), and convene a global summit to discuss the eventual elimination of nuclear stockpiles. He acknowledged that a nuclear-free world was unlikely to be achieved in his lifetime, yet his speech marked the first time a U.S. president had set out a step-by-step agenda for abolishing nuclear arms. It

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