When was this treaty ratified and who signed onto it? I know the EU Charter has a secession clause. The UK Parliament is usurping authority it does not have. The people vote to stay or leave, that is my understanding. No, my take is that the SOUTH would have argued that the situation had changed so drastically that is should have been permitted to leave the Union.I don't know that anything had changed drastically enough to allow for that, but it was at least an argument.I imagine if the U.S. had known that 600,000 men would have died in the prosecution of the war, they would not have been for the war (nor, I imagine, would the South have been for it). Sure things had changed. A party was coming to power that boasted it would do whatever it took, including defying the Supreme Court, to water down southern representation in Congress and, by default, the Electoral College. The South, realizing they would economically benefit by being free from the North, logically voted to secede. The Constitution's silence on the issue of secession meant that the Feds had no power to stop them