The Civil War, or the War Between the States if you like, resulted from the suspicion that the North meant to use the power of the Union to destroy the sovereignty of the Southern states. Whether or not that suspicion was justified, the war itself produced that very result. The South was subjugated and occupied like a conquered country. Its institutions were profoundly remade by the federal government; the United States of America was taking on the character of an extensive, and highly centralized, empire. Similar processes were under way in Europe, as small states were consolidated into large ones, setting the stage for the tyrannies and gigantic wars of the twentieth century.
Even so, the three constitutional amendment ratified after the war contain a significant clause: “Congress shall have power to enforce this article by appropriate legislation.” Why is this significant? Because it shows that even the conquerors still understood that a new power of Congress required a constitutional amendment. It couldn’t just be taken by majority vote, as it would be today. If the Congress then had wanted a national health plan, it would have begun by asking the people for an amendment to the Constitution authorizing it to legislate in the area of health care. The immediate purpose of the Fourteenth Amendment was to provide a constitutional basis for a proposed civil rights act.
But the Supreme Court soon found other uses for the Fourteenth Amendment. It began striking down state laws as unconstitutional. This was an important new twist in American constitutional law. Hamilton, in arguing for judicial review in Federalist No. 78, had envisioned the Court as a check on Congress, resisting the illicit consolidation or centralization of power. And our civics books still describe the function of checks and balances in terms of the three branches of the federal government mutually controlling each other. But in fact, the Court was now countermanding the state legislatures, where the principle of checks and balances had no meaning, since those state legislatures had no reciprocal control on the Court. This development eventually set the stage for the convulsive Supreme Court rulings of the late twentieth century, from Brown v. Board of Education to Roe v. Wade.
The big thing to recognize here is that the Court had become the very opposite of the institution Hamilton and others had had in mind. Instead of blocking the centralization of power in the federal government, the Court was assisting it.
The original point of the federal system was that the federal government would have very little to say about the internal affairs of the states. But the result of the Civil War was that the federal government had a great deal to say about those affairs — in Northern as well as Southern states.
