The main architects of the **U.S. Constitution** were a group of influential figures known as the **Founding Fathers**, including **James Madison**, **Alexander Hamilton**, and **George Washington**. These individuals were instrumental during the **Constitutional Convention** in 1787, where they debated and crafted the framework for the new American government. Their vision emphasized the principles of **checks and balances**, **separation of powers**, and **federalism**. This foundational document established the structure of U.S. government and outlined individual rights, significantly influencing the development of modern democratic systems and legal practices both in America and internationally.