Which part of the U.S. Constitution declares it to be the supreme law of the land?

The U.S. Constitution declares itself to be the supreme law of the land in Article VI. This provision, often referred to as the Supremacy Clause, establishes that the Constitution, along with federal laws and treaties made under its authority, takes precedence over any conflicting state laws. This is crucial for maintaining a uniform legal framework across the nation, ensuring that federal law is adhered to and upheld, even in states where local laws might differ.

In essence, Article VI reinforces the authority of the federal government and provides the necessary legal foundation to resolve conflicts between state and federal legislation. This structure is vital to the function of the American legal system, promoting consistency and unity in governance across all states. Other articles in the Constitution address different aspects of governance, such as the powers of the legislative, executive, and judicial branches, but it is Article VI that ensures the supremacy of the Constitution itself.