United States Trust Co. v. New Jersey

Holding a contractual impairment unreasonable in part because for "over a half century" "the need for mass transportation in the New York metropolitan area was not a new development, and the likelihood that publicly owned commuter railroads would produce substantial deficits was well known"

Energy Reserves Group v. Kansas Power Light

Holding that state law regulating intrastate price of natural gas did not substantially impair private party's contract rights because industry was heavily regulated and company had no reasonable expectation of receiving windfall from deregulated prices

General Motors Corp. v. Romein

Holding there was no contractual relationship regarding the statutory terms at issue, and therefore no violation of the Contract Clause

Alabama v. North Carolina

Rejecting an implied duty of good faith and fair dealing in interstate compacts

Pacific Gas E. Co. v. G.W. Thomas Drayage Etc. Co.

Holding that the court erroneously refused to consider extrinsic evidence offered to prove the meaning of a provision to which it was reasonably susceptible

Kansas v. Colorado

Stating "laches requires proof of lack of diligence by the party against whom the defense is asserted, and prejudice to the party asserting the defense."

Tarrant Reg'l Water Dist. v. Herrmann

Finding that because many compacts unambiguously permit signatory States to cross each other's borders to fulfill obligations under the compact, the absence of such a provision in the Red River Compact "strongly suggests that the cross-border rights were never intended to be part of the States' agreement"

U.S. Steel Corp. v. Multistate Tax Comm'n

Holding that the Multistate Tax Compact did not "enhance state power" with respect to the federal government and therefore did not require congressional consent

Texas v. New Mexico

Holding that, upon approval by Congress, a compact between states becomes federal law that binds the states

New Jersey v. State of Delaware

Noting that Delaware's CMP contains an LNG terminal ban approved in 1979

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