During Roosevelt's presidency the breaking up of corportations was made through the passing of many laws that weakened their hegemony.
Roosevelt appointed a committee of experts, economists who espoused the ideas of English economist John Maynard Keynes. These ideas influenced the creation of the state intervention plan in the economy - the so-called New Deal.
Roosevelt, through the New Deal, determined large monetary issues, carried out major public works, such as the construction of hydroelectric dams, roads, bridges, among others (stimulating employment), and, consequently, reactivated consumption, which allowed the economy to warm up. American.