The primary purpose of the Four Year Plan was to provide for the rearmament of Germany, and to prepare the country for self-sufficiency in four years, from 1936 to 1940. Aside from emphasizing the rebuilding of the nation's military defenses, in disregard of the restrictions imposed on Germany by the Treaty of Versailles after the German defeat in World War I, the Four Year Plan sought to reduce unemployment; increase synthetic fibre production, undertake public works projects under the direction of Fritz Todt, increase automobile production, initiate numerous building and architectural projects and further develop the Autobahn system.