The National Mobilization Law, enacted in 1938, was a critical piece of legislation in Japan that aimed to streamline the country's resources and manpower for wartime efforts. This law marked a significant shift towards total war, emphasizing the government's role in organizing and controlling both the economy and society to support military objectives. It was a vital tool in the rise of militarism and ultranationalism, reflecting the belief that all aspects of life should contribute to national strength and war efforts.