During World War II, defense companies like Boeing, Douglas Aircraft Company, Kaiser Shipyards, and Vigor Shipyards dominated the wartime manufacturing in the West Coast, especially in cities like Seattle, Portland, and Los Angeles. Military investment into Alaska also increased in response to the growing threat from Imperial Japan in the Pacific War. Hoping to bring the conflict further into the continental U.S., Japan launched a series of attacks by land, air, and sea on the Pacific Coast as part of the American Theater, such as the Bombardment of Ellwood, the Aleutian Islands Campaign, and the Fu-Go balloon bomb campaign.