During World War 2, the United States government instituted rationing programs to control the distribution of scarce resources on the home front. Ration books and coupons were used to limit purchases of goods like gasoline, tires, sugar, coffee, meat, and canned foods. Posters encouraged Americans to participate in rationing and conservation efforts. With many men overseas, women joined the workforce in large numbers to take jobs in factories producing war materials. Women and home gardeners also helped the war effort by growing their own food to reduce pressure on commercial food systems.