What does the Constitution do?

The Constitution serves as the foundational legal document for the United States, outlining the framework for government. It establishes the structure of government by delineating the powers and responsibilities of the three branches: the legislative, executive, and judicial. This foundational role is crucial in ensuring that the government operates within a system of checks and balances, preventing any one branch from becoming too powerful and protecting individual rights.

The other options, while relevant to the workings of government, do not accurately capture the primary function of the Constitution. Law enforcement agencies may exist due to various laws and regulations established under the auspices of the government, but they are not explicitly established by the Constitution itself. Regulating international trade falls under the powers that may be exercised by Congress, as outlined in the Constitution, but it is not a direct purpose of the document. Similarly, defining state boundaries is a matter typically addressed by state laws and agreements rather than the Constitution, which primarily focuses on the structure and powers of the federal government.