Everyone knows about the Federalists who pushed the Constitution. But far less known are the Antifederalists who warned with good reason against the creation of a new centralized government.
Source: The Antifederalists Were Eerily Prophetic - Foundation for Economic Education
There was a lot of debate leading up to the adoption of the Constitution. It's quite possible that the fledgling United States would have fallen apart had it not been adopted. However, virtually all of the warnings that the Antifederalists, those opposed to the adoption of the Constitution, made have come true. The Antifederalists' essential argument was that the Constitution did not do enough to limit Federal power and that there were aspects of the Constitution that would lead to its virtually unlimited growth.
As a side note, it's easy to find the Federalist Papers in written form but the Antifederalist writings seem much harder to come by in any organized form. I would really like to find a book that had both in context since these writings combined basically amounted to a back and forth argument. Anybody know of such a book?
They were right about central banks, international alliances, the federal government and so much more.