Explain why Article VI, Clause 2 of the United States Constitution is usually called the Supremecy Clause?

The reason why article VI, Clause 2 of the United States constitution is called the Supremacy Clause is because it establishes that the Constitution, federal laws made pursuant to it, and treaties made under its authority, constitute the "supreme Law of the Land", and thus take priority over any conflicting state laws.

It establishes that the federal constitution, or federal law, take precedence over state laws or constitutions. Have a great day <3