Thousands of Palestinians cheering and waving flags gave President Mahmoud Abbas a hero's welcome in the West Bank Sunday, as he told them triumphantly a "Palestinian Spring" had been born following his historic speech to the U.N. last week. Abbas' popularity has skyrocketed since he asked the U.N. on Friday to recognize Palestinian independence, defying appeals from Israel and the United States to return to peace talks. His request has pushed the region into uncharted waters, and left the international community scrambling over how to respond. Thousands of people crowded Abbas' West Bank headquarters in the city of Ramallah to...