Tenth Amendment
The Tenth and Eleventh Amendments are the high-water mark of state power in the American Republic. The main 1787 Constitution lists what the Federal organization might do and might not do, but it only lists a few other things the states may not do. By implication, the states could do everything else. But a great many promises had been made during the ratification campaign, some of them weakened by the atmosphere of salesmanship. The members of the First Congress convened the new government with a long list of hostile, suspicious proposals for amending what many of their constituents regarded as merely honeyed promises. In effect, the anti-federalists were demanding to "have it in writing". Under the circumstances, the most effective promise was one that was simple and short:
X. The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people.
(1669)