Which Supreme Court case ruled that the Bank of the United States was unconstitutional?

The selection of McCulloch vs. Maryland as the answer is correct because this landmark Supreme Court case addressed the constitutionality of the Second Bank of the United States. Decided in 1819, the case involved the state of Maryland attempting to impose a tax on the bank, which led to a discussion about states' rights versus federal authority. The Court, led by Chief Justice John Marshall, upheld the constitutionality of the bank, stating that federal institutions could not be taxed by states. This ruling reinforced the idea of implied powers, indicating that the federal government had powers beyond those explicitly stated in the Constitution.

Worcester vs. Georgia dealt with the rights of Native Americans and state authority, Marbury vs. Madison established the principle of judicial review, and Dred Scott vs. Sandford addressed issues surrounding slavery and citizenship. None of these cases focused specifically on the constitutionality of the Bank of the United States as McCulloch vs. Maryland did. Therefore, McCulloch vs. Maryland was pivotal in affirming the constitutional basis for the federal bank's existence and the broader implications of federal power.