What does the U.S. Constitution primarily do?

The U.S. Constitution primarily provides the structure of the federal government and protects basic rights. It outlines the organization and powers of the three branches of government: the legislative, executive, and judicial branches, establishing a system of checks and balances to ensure no one branch becomes too powerful. Additionally, the Constitution includes the Bill of Rights, which enumerates individual freedoms and protections such as freedom of speech, religion, and due process, safeguarding citizens' rights against government infringement. This foundational document serves as the supreme law of the land, guiding the principles and functioning of the U.S. government and ensuring the protection of liberties for its citizens.