U.S. ConstitutionArticle I — The Legislative BranchSubarticle 9Section 6
No Preference shall be given by any Regulation of Commerce or Revenue to the Ports of one State over those of another: nor shall Vessels bound to, or from, one State, be obliged to enter, clear, or pay Duties in another.
Use as reference
Lexinter.net | U.S. Const. art. I, § 9, cl. 6 | https://laws.lexinter.net/constitution/us/article-1/section-9/clause-6