This is a casebook for First Amendment courses in law schools in the United States. It covers all the major topics under the First Amendment, including freedom of speech, freedom of association, freedom of the press, and the Religion Clauses. Our casebook is designed to be approachable to a wide range of instructors and students. It emphasizes the actual language of important Supreme Court decisions in this area, and so presents opinions with relatively light editing. The book also avoids long, discursive note materials that, in the authors' view, tend to distract or overwhelm most students. Finally, this casebook relies heavily on problems as a tool that instructors can employ to advance and confirm students' understanding of the covered topics.