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Many important state concerns are within the power of states to regulate (e.g., highway safety, waste disposal, environmental degradation) but state regulation of such concerns can have, in today's world, substantial impacts outside the state. This program diagrams the three constitutional clauses which govern the validity of state impacts of this kind: the so-called Dormant Commerce Clause, the Supremacy Clause and the Privileges and Immunities Clause.
A basic diagram or flow-chart is developed, after which, the program provides summaries of the principal doctrines and digests of several of the landmark cases. The program is not an extended textual treatment of the issues; instead, it is an effort to show in graphic form the components of the various doctrines and how they relate. From there, the student should be able to read other cases and texts with more understanding.