The document discusses the principle of federalism established by the US Constitution. It divides government responsibilities between the federal and state levels. While federalism is not explicitly mentioned, the Constitution outlines powers held solely by the federal government, shared powers, and those reserved for the states. This has led to ongoing debates around the interpretation of the 10th Amendment and the balance of federal and state authority. The document provides examples of how federalism applies to different public policy areas like the economy, education, the environment, healthcare, and welfare.