The U.S. court system

Describe your understanding of the U.S. court system at both the state and federal levels? Be sure to touch on the roles of the court at each level. How do cases reach the U.S. supreme court? How do the justices render their decisions? How would you define judicial review? Where did it come from? What is it used for? Considering that the judicial branch is an unelected branch of government, should judicial activism be a proper exercise of judicial power? Why or why not? Considering that the judicial branch is an unelected branch of government, should judicial restraint be a proper exercise of judicial power? Why or why not?