George Washington served as the first President of the United States and helped establish the structure and powers of the executive branch. He appointed the first Cabinet, including Alexander Hamilton as Secretary of Treasury and Thomas Jefferson as Secretary of State. Hamilton and Jefferson disagreed over the interpretation of Congressional authority, with Hamilton favoring a loose interpretation allowing more federal power and Jefferson preferring a strict interpretation reserving more powers for states. Washington's presidency established many precedents and saw the emergence of the first political parties in the United States.