U.S. President Barack Obama addresses the 64th United Nations General Assembly in New York

U.S. President Barack Obama addresses the 64th United Nations General Assembly, at the U.N. headquarters in New York, September 23, 2009. Obama on Wednesday promised a new era of U.S. engagement with the world, saying that only by acting together can mankind overcome pressing global challenges. REUTERS/Mike Segar (UNITED STATES POLITICS)