It was this president [from 1933 – 1945] who was confronted with the severest of economic disasters in US history. He turned to Keynesian economics to address the formidable challenges.
Keynes advised sharply increased government spending and lower taxes. His theory focused on using active government policies, interfering in markets to stimulate consumer demand and thus pulling the economy out of the depression. A whole array of programs [building infrastructure, dams, parks, etc.] formed the “New Deal”, FDR´s plan for recovery. In the end, it was the gigantic war production of 1941 – 1945 that pulled the economy definitely out of the depression.