Article I, Section 10 contains a long, somewhat diverse list of prohibitions on the power of the states to engage in certain activities. Understanding its significance depends on first placing it within the larger framework of Article I, which is primarily devoted to setting out the structure of Congress and then enumerating its legislative powers. Those activities occupy Sections 1 through 8. Section 9 prohibits a broad array of activities by the federal government, which run the gamut from weakening the privilege of the writ of habeas corpus to taxing exports from the states.
Section 10 imposes a similar list of prohibitions on the powers of the states. Clause 1 contains absolute prohibitions that Congress cannot waive. Clauses 2 and 3 impose prohibitions that Congress can waive—presumably by legislation, although the text does not make clear whether any joint resolution is subject to a presidential veto. It is difficult to explain why the prohibitions found in Clause 1 cannot be waived by Congress while those in the last two clauses can be. But in both cases, the state interests are made subordinate to those of the national government.
These prohibitions in Section 10 can be divided into several subclasses. One group imposes on the states some of the restrictions that Section 9 imposed on Congress: the power to pass bills of attainder or ex post facto laws, or to grant titles of nobility. A second category guarantees that matters of war and diplomacy belong primarily or exclusively to the national government. The states are prohibited from forming compacts with foreign nations or even with each other without the assent of Congress.
A third category applies to financial matters, dealing with such issues as the power to coin money, emit bills of credit, or lay duties on imports and exports. During the Revolutionary War, both the Continental Congress and the states resorted to the massive issuance of various instruments of credit, unsecured by adequate taxation. The resulting depreciation in the value of these instruments, coupled with the corresponding inflation of prices, created a strong consensus to empower Congress to secure the public credit of the United States by levying its own taxes and limiting, though hardly eliminating, the financial powers of the states. Under the Articles of Confederation, both the Continental Congress and the states had the authority to coin money, but only Congress could fix its “alloy and value.” The evident intention is to give that power exclusively to Congress under Article I, Section 8, Clause 5.
Section 10, Clause 1 contains a general prohibition against states emitting letters of credit, unless, as it came to be understood, they were drawn on some specific fund set aside for that purpose. The result reads like a compromise designed to prevent the open-ended use of state credit without shutting down the capacity of the states to borrow at all. These provisions, together with the requirement that only gold and silver could be used for legal tender, stem from the desire to insulate other states in the union from the fiscal shocks created by any single state.
A fourth category coordinates the respective powers of the state in domestic and foreign affairs. There is an evident tension between the absolute prohibition on “any treaty, alliance, or confederation” found in Clause 1, and the apparent authorization to enter into any agreement or compact with another state or foreign power so long as Congress consented. Finally, it is worth noting that the Union was considered sufficiently fragile that Section 10, Clause 3 allows for the states to “engage in War,” waiving the requirement of congressional consent in cases of imminent danger. Indeed, these military issues loomed large in the Founding period because Article I, Section 8, Clauses 15 and 16 and Article II, Section 2, Clause 1 also contain detailed provisions for the maintenance of state militias and the circumstances under which they could also be called into the service of the United States. Lastly, the Guarantee Clause of Article IV, Section 4 deals primarily with the threat of invasion for which either congressional or presidential intervention is then contemplated. The mechanics of all these provisions are exceedingly complex, and none are set out in the Constitution.
The single provision of Article I, Section 10 that has brought forth the greatest amount of litigation is the Contracts Clause, which categorically declares, “No state shall . . . pass any Law Impairing the Obligation of contract.” Like other limitations on the financial powers of the states, this Clause reflected the fears of the propertied classes who favored the adoption of the Constitution that the state legislatures might well enact laws adversely affecting the just rights of creditors. After 1810, the expansive definition of the Contracts Clause revealed how broadly the Supreme Court, under Chief Justice John Marshall, viewed the danger of intrusive state legislation. Thus from as early as Fletcher v. Peck (1810) and Dartmouth College v. Woodward (1819), the Clause was held to apply not only to private agreements, but also to state charters that could not be revoked except upon payment of just compensation to proprietors. It was also understood that the Contracts Clause was not limited to debtor-creditor relationships, but applied to all contracts, notably including charters of incorporation granted by legislatures.
In addition, the Contracts Clause was read to afford protection to both sides of the agreement—buyer and seller, creditor and debtor, grantor and grantee. The Supreme Court also held, in Sturges v. Crowninshield (1819) that the Contracts Clause protected rights under contracts previously formed. Yet by a 4-3 vote, with Chief Justice Marshall and Justice Story dissenting, the Court held in Ogden v. Saunders (1827) that the Contract Clause did not protect from legislative invalidity any contracts made after a particular statute was enacted. The early cases also recognized a police power exception of uncertain scope for cases dealing with the public safety, health, general welfare, and morals. Finally, there was additional uncertainty as to whether the Contracts Clause (like the Takings Clause of the Fifth Amendment) provided protection against state judicial as well as legislative actions.
The adoption of the Fourteenth Amendment, which imposed many direct limitations on state power, subject to both judicial and congressional enforcement, meant that the Contracts Clause was no longer the only avenue to impose new limitations on the exercise of state power. Nonetheless, in this context, the Clause’s relative specificity has led to extensive litigation over the question of whether its systematic application, like that of the Due Process and Equal Protection Clauses, continues to impose meaningful restrictions on major programs from mortgage moratoria to pension plan solvency, from bankruptcy reform to government lending practices.
The larger debate today raises in its most general form the question of whether rational basis review or higher scrutiny should be applied to claims brought under the Contracts Clause, both as to the scope of its basic coverage and the size and power of the exceptions. This debate is but one of many facets of the choice between the classical liberal and progressive views of constitutionalism, which pivoted sharply toward the progressive view during the 1930s, where for the most part it remains today.