Constitutional law and theory textbooks study the basic laws of a nation, typically established by a codified constitution or some other written foundation. In the United States, constitutional law is examined at both the state and federal level, with the Constitution and the Bill of Rights being its north star. Your constitutional law textbooks will cover a range of topics, from civil procedure to Supreme Court rulings. As for the “theory” part of constitutional law and theory, that involves the interpretation and evolution of the law through continued rulings. Some laws stay the same, and some change – but why? This collection holds the answers.