Home > West's Encyclopedia of American Law > Supremacy Clause

Article VI, Section 2, of the U.S. Constitution is known as the Supremacy Clause because it provides that the "Constitution, and the Laws of the United States … shall be the supreme Law of the Land." It means that the federal government, in exercising any of the powers enumerated in the Constitution, must prevail over any conflicting or inconsistent state exercise of power.

The concept of federal supremacy was developed by Chief Justice JOHN MARSHALL, who led the Supreme Court from 1801 to 1835. In MCCULLOCH V. MARYLAND, 17 U.S. (4 Wheat.) 316, 4 L. Ed. 579 (1819), the Court invalidated a Maryland law that taxed all banks in the state, including a branch of the national bank located at Baltimore. Marshall held that although none of the enumerated powers of Congress explicitly authorized the incorporation of the national bank, the