Not so much "fell apart" as "intentionally overthrown by capitalists when they didn't agree with policies determined through democracy". Madison and his co-conspirators didn't approve of the deliberate currency depreciation and other measures voted in by farmers who fought, unpaid, for years in a war that benefited rich elites and came home to find their farms repossessed by debtors and tax collectors. So long as the various states operated as competing democracies, they were subject to the wishes of their citizens. The constitution, written in secret by a cabal of rich white men, put an end to all of that, as it was intended to do.