McCulloch v. Maryland, , was a landmark decision by the Supreme Court of the United States. The state of Maryland

Maryland

Maryland is a U.S. state located in the Mid Atlantic region of the United States, bordering Virginia, West Virginia, and the District of Columbia to its south and west; Pennsylvania to its north; and Delaware to its east...

 had attempted to impede operation of a branch of the Second Bank of the United States

Second Bank of the United States

The Second Bank of the United States was chartered in 1816, five years after the First Bank of the United States lost its own charter. The Second Bank of the United States was initially headquartered in Carpenters' Hall, Philadelphia, the same as the First Bank, and had branches throughout the...

 by imposing a tax

Tax

To tax is to impose a financial charge or other levy upon a taxpayer by a state or the functional equivalent of a state such that failure to pay is punishable by law. Taxes are also imposed by many subnational entities...

 on all notes

Banknote

A banknote is a kind of negotiable instrument, a promissory note made by a bank payable to the bearer on demand, used as money, and in many jurisdictions is legal tender. In addition to coins, banknotes make up the cash or bearer forms of all modern fiat money...

 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 recognized in the court's opinion as having specifically targeted the U.S.