The Anti-Federalists found many problems in the Constitution. They argued that the document would give the country an entirely new and untested form of government. They saw no sense in throwing out the existing government. Instead, they believed that the Federalists had over-stated the current problems of the country. They also maintained that the Framers of the Constitution had met as an elitist group under a veil of secrecy and had violated the provisions of the Articles of Confederation in the means selected for ratification of the Constitution.<span>
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I can't really answer your question (as I don't really know enough about 18th century France), but I just want to clear up an (understandable) misconception about Feudalism in your question.
The French revolution was adamant and explicit in its abolition of 'feudalism'. However, the 'feudalism' it was talking about had nothing at all to do with medieval 'feudalism' (which, of course, never existed). What the revolutionaries had in mind, in my own understanding of it, was the legally privileged position of the aristocracy/2nd estate. This type of 'feudalism' was a creation of early modern lawyers and, as a result, is better seen as a product of the early-modern monarchical nation-state, than as a precursor to it. It has nothing to do with the pre-nation-state medieval period, or with the Crusades.
Eighteenth-century buffs, feel free to chip in if I've misrepresented anything, as this is mostly coming from my readings about the historiographical development of feudalism, not any revolutionary France expertise, so I may well have misinterpreted things.
