Following the attack on Pearl Harbor and the entry of the United States into World War II, many commercial advertisers and their Madison Avenue ad agencies instantly switched from selling products and services to selling the home front on ways to support the war. Ads by major manufacturers showcased how their factories had turned to war production, demonstrating their participation in the war and helping people understand, for instance, that they couldn't buy a new washing machine because the company was making munitions. Other ads helped civilians cope with wartime rationing and shortages by...