The end of Hosni Mubarak’s regime in Egypt portends fundamental change throughout the Middle East and the end of the American era in the region. Mubarak was the archetype authoritarian that Washington has relied upon to help maintain a regional political order that made it relatively easy to exercise American power. The Egyptian strongman kept the peace with Israel, the Suez Canal open, and the Islamists down. If he was often brutal without being repressive in the ways of Iraq’s Sadd...