McCulloch v. Maryland, 17 U.S. (4 Wheat.) 316 (1819), was a U.S. Supreme Court decision that defined the scope of the U.S. Congress's legislative power and how it relates to the powers of American state legislatures. The dispute in McCulloch involved the legality of the national bank and a tax that the state of Maryland imposed on it. In its ruling, the Supreme Court established firstly that the "Necessary and Proper" Clause of the U.S. Constitution gives the U.S. federal government certain implied powers that are not explicitly enumerated in the Constitution, and secondly that the American federal government is supreme over the states, and so states' ability to interfere with the federal government is limited

The state of Maryland had attempted to impede an operation by the Second Bank of the United States through a tax on all notes of banks not chartered in Maryland. Though the law, by its language, was generally applicable to all banks not chartered in Maryland, the Second Bank of the United States was the only out-of-state bank then existing in Maryland, and the law was thus recognized in the court's opinion as having specifically targeted the Bank of the United States. The Court invoked the Necessary and Proper Clause of the Constitution, which allows the federal government to pass laws not expressly provided for in the Constitution's list of express powers if the laws are useful to further the express powers of Congress under the Constitution.

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