I am sure there are more besides. The long and the short of the problem is the 14th Amendment, along with the Amendments that created direct taxation and direct elections of Senators. All three undercut the state sovereignty approach that the Federalist Papers argued would be preserved in the original Constitutional framework. Right or wrong, they are there. There is no guarantee in a Constitutional Republic that later generations won't make foolish changes and/or make wrong interpretations that lead to unintended consequences. As Ben Franklin told a lady about what we got, "you have a republic, IF YOU CAN KEEP IT." Not all experiments end well and we are seriously testing whether a "nation so conceived, can long endure."