what is the supreme law of the land?

The supreme law of the land in the United States is the Constitution. All laws in the United States must follow the Constitution, and any law that violates the Constitution is considered unconstitutional. The Constitution is the source of all government powers and provides important limitations on the government that protect the fundamental rights of United States citizens. The Constitution is also the basis for the oath or affirmation that all Senators, Representatives, members of state legislatures, and executive and judicial officers must take to support the Constitution.