Until August of 2011, Andrew Bast was a senior editor at Newsweek. Now at the Council on Foreign Relations, he is the editor of ForeignAffairs.com. He has reported from four continents for several outlets, including The Washington Quarterly and the New York Times. Follow him on Twitter: @andrewbast

Six months after a food vendor sparked a revolution in Tunisia, uprisings across the Arab world have toppled despots in Egypt and Yemen, still threaten regimes in Libya and Syria, and changed the calculus for regional heavyweights like Israel, the Saudis—and the U.S. Andrew Bast reports. SEE photos from the unrest that has gripped the region.