the USPS is authorized by the Constitution explicitly authorized The Constitution and the Post Office a direct part of the federal government about.usps.com... Constitution (Sec 1, Art 8) promised the USPS is authorized by the Constitution the USPS is authorized by the Constitution the USPS is authorized by the Constitution a direct part of the federal government https://about.usps.com/publications/pub100/pub100_005.htm Constitution (Sec 1, Art 8) promised Constitutionally-mandated