According to Article VI, the Constitution and laws of the United States are “the supreme law of the land.” Both state and federal officials, including judges, must take an oath to support the Constitution, even if state law contradicts it. Unlike the Articles of Confederation, the Constitution trumps state power. However, the Constitution also protects the powers of the states in many ways. This system of federalism, in which the national and state governments share power, is a key feature of American government. Article VI also guarantees a measure of religious freedom by banning religious tests for public office.