A provision contained in Article I, Section 10, Clause 3, of the U.S. Constitution, which states, "No State shall, without the consent of Congress … enter into any Agreement or Compact with another State." Intended to curtail the increase of political power in the individual states that might interfere with the supremacy of the federal government or impose an unconstitutional burden on interstate commerce in violation of thecommerce clause.
"Compact Clause." West's Encyclopedia of American Law. . Encyclopedia.com. (November 17, 2018). https://www.encyclopedia.com/law/encyclopedias-almanacs-transcripts-and-maps/compact-clause
"Compact Clause." West's Encyclopedia of American Law. . Retrieved November 17, 2018 from Encyclopedia.com: https://www.encyclopedia.com/law/encyclopedias-almanacs-transcripts-and-maps/compact-clause