http://en.wikipedia.org/wiki/Gulf_War
The Gulf War
Six days after Iraq invaded Kuwait on August 2, 1990, the United States started to deploy Army, Navy, Marine, Air Force, and Coast Guard units to Saudi Arabia (Operation Desert Shield), while at the same time urging other countries to send their own forces to the scene. U.N. coalition-building efforts were so successful that by the time the fighting (Operation Desert Storm) began on January 17, 1991, twelve countries had sent naval forces, joining the local nations of Saudi Arabia and the Persian Gulf states, as well as the huge array of the U.S. Navy, which deployed six aircraft-carrier battle groups
The oil price jump to $40 starting Aug, 1990. It is back when Saudi interfere market.
