“No State shall, without the Consent of Congress… enter into any Agreement or Compact with another State…” (US Constitution, Article I, Section 10, Clause 3). Explanation by US Senate: “States may come together to work on common problems, such as pollution of a river passing through several states, but the agreements or compacts they reach are subject to congressional consent.” (Supreme Court Review)
Our Founders' Warning: “Every government degenerates when trusted to the rulers of the people alone. The people themselves are its only safe depositories.” (Thomas Jefferson)