The United States Constitution is the supreme law of the United States, outlining the framework of the government and the rights of the citizens. It was drafted in 1787 and established three branches of government: the legislative, executive, and judicial. This separation of powers ensures that no single branch becomes too powerful, promoting a system of checks and balances. The Constitution also includes the Bill of Rights, which consists of the first ten amendments that guarantee essential freedoms, such as freedom of speech and religion. Together, these elements create a foundation for democracy and protect individual liberties in the United States.