McCullough v. Maryland was a landmark Supreme Court case in 1819 that established the principle of federal supremacy over state governments. The case involved a dispute over the constitutionality of the Second Bank of the United States and whether the state of Maryland had the authority to tax it. The Court ruled that the federal government had the right to establish a national bank and that Maryland's tax on the bank was unconstitutional. This decision strengthened the powers of the federal government and affirmed the concept of implied powers in the Constitution.
