This inquiry leads students through an investigation of the perennial power struggle between federal and state governments to legislate. By investigating the compelling question “Who has the power?” students will consider the role of state government in initiating the best legislation for its citizens, even in cases where state law conflicts with federal law. In investigating evidence from historic and contemporary sources, students develop an interpretation of federalism and begin to evaluate both the historic and contemporary arguments and issues that are, in the words of Chief Justice John Marshall, “perpetually arising, and will probably continue to arise, as long as our system shall exist.”