In 1819 the supreme court used supremacy clause to rule that state of Maryland had what tax federal bank?

The Supreme Court case you are referring to is McCulloch v. Maryland, which was decided in 1819. In this case, the Supreme Court ruled that the State of Maryland did not have the authority to tax the Baltimore branch of the Second Bank of the United States. The Court held that the federal government had the power to create a national bank and that state laws could not interfere with the operation of a federal institution. This decision established the principle of federal supremacy, which means that federal laws take precedence over state laws when there is a conflict between the two.