1) Franklin D. Roosevelt introduced modern liberalism and Keynesian economic policies through his New Deal in response to the Great Depression in order to intervene in the failing free market system and rescue the suffering US economy. 2) The New Deal incorporated aspects of Keynesian economics like public works programs and social security to provide relief and economic recovery. 3) While the US is considered a free market economy, no country has a truly free market because governments intervene to some degree, as Roosevelt and modern liberals like Obama have recognized, in order to maintain economic stability.