Constitutional authority refers to the power and legitimacy granted to government entities by a constitution. In the United States, this authority is derived from the U.S. Constitution, which outlines the structure of government, the powers of different branches, and the rights of citizens. It serves as the supreme law, guiding how laws are made and enforced. This authority ensures that government actions are based on established legal frameworks, preventing arbitrary rule. It also allows for checks and balances among the executive, legislative, and judicial branches, promoting accountability and protecting individual rights within the framework of the law.