"Secession was illegal. The Union was and is perpetual. The founders intended it so. Madison's letter to Hamilton, 'The Constitution requires an adoption in toto, and for ever', during the New York ratification debates demonstrate that decisively. But on an even more profound scale, the ratification process itself demonstrates that the founders intended the permanence and strength of the Union. They had had it with powerful states. That's why the founders stated in Article VII that ratification had to happen in special conventions, not the state legislatures. If the founders had left it to the state legislatures, those legislatures would have rejected the document out of hand. But the special ratifying conventions were different. They were composed of delegates elected by 'We The People' of each state, not the state itself. In addition, the states liberalized voting rules by getting rid of the property qualifications. This was a special one-time-only thing in order to ensure the broadest possible participation to select delegates in order to make it as democratic as the 18th century mindset would allow. In the north, five states even allowed blacks the right to vote."