Following Japan's surprise attack on Pearl Harbor, the U.S. entered World War II and the whole Puget Sound region was full on rolling in the nation's war effort. Among the chief priority was the federal government's sudden desire for tens of thousands of planes a year, and Boeing was positioned to provide them. Working under fixed-fee contracts, Boeing churned out aircraft and became by far the largest employer in Seattle. During the war, Seattle ranked as one of the top three cities in the nation in contracts per capita, and Washington state ranked as one of the top two in the nation for war contracts per capita. Seattle and Renton produced 8,200 planes, including 6,981 B-17s and more than 1,000 B-29 bombers. Civilian use of Boeing Field was greatly curtailed to accommodate the production of thousands of Boeing bombers. To accommodate the war effort, the U.S. military also annexed McChord Field in Tacoma, prompting that city to plead with the Port of Seattle to develop Seattle-Tacoma International Airport at Bow Lake -- midway between the Sound's two major cities.