One result of the Supreme Court's decision in McCulloch v. Maryland was the established supremacy of the United States law.
The Supreme Court case McCulloch v. Maryland established that Congress had the power to establish a national bank and that a state (in this case, Maryland) did not have the power to tax branches of the federal government that are carrying out powers legal in the Constitution.
On March 6, 1819, the U.S. Supreme Court ruled in McCulloch v. Maryland that Congress had the authority to establish a federal bank, and that the financial institution could not be taxed by the states.
McCulloch v. Maryland (1819) is one of the first and most important Supreme Court cases on federal power. In this case, the Supreme Court held that Congress has implied powers derived from those listed in Article I, Section 8. The “Necessary and Proper” Clause gave Congress the power to establish a national bank.