What did the Supremacy clause provide?

The Supremacy Clause, found in Article VI, Clause 2 of the U.S. Constitution, establishes that the Constitution, Federal Laws, and treaties made under its authority are the supreme law of the land. This means that when state laws or constitutions conflict with federal law, federal law prevails. It ensures a uniform legal framework across the country and reinforces the authority of the federal government over states in matters governed by federal law.