The state was one of the two American states attacked and invaded by Soviet Ground Forces during World War III, of which the other was Alaska. Subsequently, Vancouver Island and the Canadian Province of British Columbia was invaded as well. The Soviets used captured air bases to launch bombing raids to other cities in the American West Coast, namely Portland, San Francisco, Oakland, Stockton, San Bernardino, Los Angeles, and San Diego. However, despite the fall of Seattle, Tacoma, and Olympia, the Soviets only controlled at most 2/4 of the state. They were unable to push passed the Cascade Mountain Range. U.S. military units, along with remnant law enforcement units and civilian militia, fought a war of attrition against the Soviet invaders. This would pave way for the success of the liberation of Washington, in which reinforcements from the East successfully drove out the Soviets back to the Pacific Ocean.
On September 11, 2001, the city of Seattle was targeted by pro-communist terrorists because of its significance of American resistance during the Soviet occupation.