Which tool, used by President Franklin D. Roosevelt, moved the country from duel federalism to cooperative federalism?

President Franklin D. Roosevelt moved the country from dual federalism to cooperative federalism using the supreme court to make constitutional changes to new deal policies.

Explanation:

Dual Federalism: also known as layer-cake federalism or divided sovereignty, is a political arrangement in which power is divided between the federal and state governments in clearly defined terms, with state governments exercising those powers accorded to them without interference from the federal government.

Cooperative Federalism: also known as marble-cake federalism, is a concept of federalism in which federal, state, and local governments interact cooperatively and collectively to solve common problems, rather than making policies separately but more or less equally (such as the dual federalism of the 19th-century.