Article I, Section 8, Clause 7 of the U.S. Constitution granted Congress the authority to establish a postal service. The U.S. Postal Service now provides the infrastructure, legal framework and logistical reach necessary to serve nearly every address in the U.S.
While Stewart suggests that private companies like UPS, FedEx and Amazon could do the job more efficiently, USPS is generally cheaper for packages under 12 ounces.
Unlike the USPS, private carriers do not provide legally recognized proof of delivery and cannot handle classified materials or official documents such as court summonses, tax notices or property liens. They are not required to deliver or accept anything.
