The primary purpose of the Supremacy Clause is to establish the relationship between federal and state powers and the scope of their powers.
The Supremacy Clause is the highest form of law in the U.S. It establishes that in case of a conflict between federal and state laws, the federal law, or the U.S. Constitution, must prevail, this means that the scope of the state laws is limited by the federal's law. This way, the Supremacy Clause prevents states from assuming functions that are only entrusted to the federal government.
