What is the main purpose of the U.S. Constitution?

The main purpose of the U.S. Constitution is to create a framework for government and define its powers. This foundational document was designed to establish the structure of the national government, delineate the responsibilities and powers of its branches (executive, legislative, and judicial), and to ensure a system of checks and balances among them. By doing so, the Constitution aims to prevent any one branch from becoming too powerful and to protect the rights of the individual and the states.

While the Bill of Rights, which comprises the first ten amendments to the Constitution, is indeed important in safeguarding individual liberties, it is a component of the larger framework established by the Constitution rather than its sole purpose. Asserting federal supremacy over the states is also an outcome of the Constitution's design, particularly as articulated in the Supremacy Clause, but it is not the main purpose. Furthermore, the U.S. Constitution is distinctly republican and democratic in nature, designed to replace any form of monarchy, standing in contrast to the suggestion that it establishes such a system.