The document summarizes the key aspects of federalism established by the US Constitution. It establishes a federal system that divides power between the national and state governments. The national government is granted expressed powers listed in the Constitution like defense, currency, and foreign affairs. State governments are given reserved powers over local issues like marriage, drinking ages, and business regulation. Concurrent powers like taxation and criminal law can be exercised by both levels. The 10th Amendment establishes that powers not given to the national government nor prohibited to the states are reserved for the states or the people.