Furthermore, since the U.S. is the guarantor of my freedom, and if a state can secede from it-threatening my freedom-then secession is illegal.
Look, I am a born and bred Alabaman, and I've heard it all on nullification and states rights. And I don't buy it. If the South had won, after voluntarily participating in the Election of 1860, I probably wouldn't be here today. None of us would. Those of us Down South would probably be part of the Commonwealth.
As far as your Reveloutionary argument, King George & Parliament left us, we didn't leave them. And won our freedom on the Battlefield, that ultimate issue solver (see Civil War).
Being part of the British Commonwealth would have been a good outcome if the South had won, but I doubt it would have happened. The Brits ended chattel slavery in their colonies in the 1830s and the South would have never allowed that. I could see the region degrading into another Mexico, however. The landed aristocracy running the show for the peasants --- both black and white. That was the course their "society" was headed to.
By winning the war, Lincoln did far more for the South than he did the North.