FILE - In this Feb. 11, 2011 file photo, anti-government protesters perform the Muslim Friday prayers at the continuing demonstration in Tahrir Square, Cairo, Egypt. Ten years ago, an uprising in Tunisia opened the way for a wave of popular revolts against authoritarian rulers across the Middle East known as the Arab Spring. For a brief window as leaders fell, it seemed the move toward greater democracy was irreversible. Instead, the region saw its most destructive decade of the modern era. (AP Photo/Tara Todras-Whitehill)