When protesters in Egypt began to fill Cairo's Tahrir Square on January 25th--and refused to leave until their demand that Hosni Mubarak step down was met--the politics of the region changed overnight. And the United States' long friendship with the man who had ruled under Emergency Law for thirty years came starkly into question. From Franklin D. Roosevelt's brief meeting with King Farouk near the end of World War II to Barack Obama's Cairo Speech...