What is the highest law of the land in the United States?

The Constitution serves as the highest law of the land in the United States because it establishes the foundational legal framework for the country. It outlines the structures of government, delineates the powers and responsibilities of each branch, and ensures the protection of individual rights through its amendments, including the Bill of Rights. The supremacy of the Constitution means that any law or government action that conflicts with it is invalid. This principle is upheld by the judicial system, which interprets the Constitution and resolves disputes regarding its meaning and implementation. Other documents, such as the Declaration of Independence, the Bill of Rights, and the Articles of Confederation, hold significant historical and legal importance, but they do not possess the same authority as the Constitution in terms of being the ultimate legal standard in the U.S.