Article VI of The United States Constitution states that the "Constitution, and the Laws of the United States which shall be made in Pursuance thereof; and all treaties made or shall be made, under the Authority of the United States, shall be the Supreme Law of the Land." See The Supremacy Clause: U.S. Constitution, art. VI, § 2. Furthermore, all federal, state, and local officials must take an oath to support the Constitution. This means that state governments and officials cannot take actions or pass laws that interfere with the Constitution, laws passed by Congress, or treaties. The Constitution was interpreted, in 1819, as giving the Supreme Court the power to invalidate any state actions that interfere with the Constitution and the laws and treaties passed pursuant to it. That power is not itself explicitly set out in the Constitution but was declared to exist by the Supreme Court in the decision of McCulloch v. Maryland.