1 Explain the crucial elements of a federal system and how such a system differs from a unitary or confederal system.2 Explain the difference between enumerated and implied powers in the U.S. Constitution. Where are such powers found within the document?3 Explain what types of power remained reserved to the states under the U.S. federal system. What are the sources of these powers?4 How have the general trends of the Supreme Court's interpretation of federal versus state sovereignty changed over time?5 How has the relationship between the federal government and state governments changed over the course of the twentieth century? What were some of the major causes of these changes?