For the United States, revolution in Saudi Arabia would be a game changer. While the U.S. can live without Saudi oil, China, India, Japan, and Europe cannot. Any disruption in Saudi oil exports—whether due to unrest, cyberattacks, or a new regime’s decision to reduce exports substantially—will have a major impact on the global economy. In addition, the CIA war against al Qaeda is heavily dependent on the kingdom: Saudi intelligence operations foiled the last two attacks by al Qaeda in the Arabian Peninsula on the American homeland. The U.S. military training mission in the kingdom, founded in 1953, is the largest of its kind in the world. The Saudis also have been a key player in containing Iran for decades.