Summarizing recent events worldwide, President Obama told the UN General Assembly today that this has been "a remarkable year." He talked of ending the war in Iraq and "building an enduring partnership with the Afghan people," and applauded international efforts to create the nation of South Sudan and bolster democracy in Cote D'Ivoire. He also cautioned that "peace is hard. Progress can be reversed. Prosperity comes slowly. Societies can split apart." Massimo Calabresi is Washington correspondent for Time magazine.