What is constitutional law based on?

Constitutional law is fundamentally based on federal and state constitutions. These documents outline the structure of government, define the powers and responsibilities of various government entities, and establish the rights of individuals. The federal constitution serves as the supreme law of the land, meaning that it takes precedence over any conflicting state laws or local ordinances. State constitutions can provide additional rights and protections beyond those found in the federal constitution, creating a dual layer of constitutional law.

Understanding that constitutional law derives from both federal and state sources is critical, as this framework guides the interpretation and application of laws across different jurisdictions. It also underpins the legal principles that govern judicial review and the protection of civil liberties. In contrast, international agreements pertain to treaties or contracts between nations and do not directly inform constitutional law in the United States. Similarly, state laws and local ordinances function within the framework set by constitutions but are not the foundational basis of constitutional law.