Supremacy Clause: Found in Article VI, Clause 2 of the U.S. Constitution, the Supremacy Clause establishes that the Constitution, federal laws, and treaties are the "supreme Law of the Land." This clause ensures that federal law prevails over state law in cases of conflict, promoting a uniform legal framework across the nation. It mandates that state judges must uphold federal laws even when state laws or constitutions conflict.

Preemption Doctrine: Preemption, derived from the Supremacy Clause, occurs when federal law overrides or preempts state law. The chapter explains the two types of preemption:

Impact on State Laws: The chapter discusses how preemption reflects the tension between state sovereignty and federal authority. While it ensures national uniformity in law, it can also limit states' ability to regulate matters within their borders. The courts, particularly the Supreme Court, play a crucial role in determining the boundaries of preemption.

Key Case Law: The chapter highlights significant Supreme Court cases, such as McCulloch v. Maryland and Arizona v. United States, which have shaped the interpretation of the Supremacy Clause and preemption.

Federal Preemption in Practice: The chapter provides examples of how preemption operates in areas like healthcare, environmental regulation, and consumer protection, illustrating the practical implications of the doctrine.

Interstate Relations and the Full Faith and Credit Clause: The chapter also covers the Full Faith and Credit Clause, which requires states to recognize and honor the public acts, records, and judicial proceedings of other states, promoting legal consistency and cooperation across state lines.

Privileges and Immunities Clause: This clause prevents states from discriminating against citizens of other states, ensuring that all citizens enjoy the same rights and protections when they travel or move between states.