who has the power to set up a postal system
United States Postal Service The official post office was created in 1792 as the Post Office Department (USPOD). It was based on the Constitutional authority empowering Congress "To establish post offices and post roads". The 1792 law provided for a greatly expanded postal network, and served editors by charging newspapers an extremely low rate. The law guaranteed the sanctity of personal correspondence, and provided the entire country with low-cost access to information on public affairs, while establishing a right to personal privacy.[13]