U.S. Constitution, Article I — The Legislative Branch, Section 8, Clause 7
To establish Post Offices and post Roads;
Notes
Allows Congress to establish post offices and post roads. The clause places the creation of the postal system, including both the offices that handle mail and the roads designated for carrying it, with Congress rather than with the individual states.
Use as reference
Lexinter.net | U.S. Const. art. I, § 8, cl. 7 | https://laws.lexinter.net/constitution/us/article-1/section-8/clause-7