No, all people have that right. Didn't you read the quote? "Any people anywhere..." Right there in the beginning. Lincoln happened to be speaking of Texans and Mexico but it's clear he means anyone.
They did leave through peaceful means. It was the United States that provoked the war.
The discussion was whether Lincoln was supporting secession in his 1848 speech. Obviously he was not.
But I'll also point out that neither Buchanan or Lincoln did anything to oppose secession forcibly until such time as the South chose to go to war over Sumter. All hostile actions had been on the part of the South - firing on ships on at least two occasions, trying to starve the fort into surrender, you name it. You can claim that Lincoln tricked them or Lincln forced them and it's all nonsence. The question of peace or war was in the hands of the Davis regime. They could have allowed the fort to be resupplied and let the status quo continue and for Lincoln to lose support for ending secession, but they chose otherwise. Sumter, to them, was worth starting a war over. That war, and all the death and destruction visited upon them as a result, was the South's choice.
Secession is simply defined as a formal separation, of which the Confederates States did just that.
I think that legal separation is implied, and that's what was missing in the South's actions.
You have never been able to define what you think the Constitution requires as a “legal means” of separation because the Constitution doesn’t.
I have on several occasions, the latest with Bigun over the last two days. Go look it up.
You simply hate southerners and have said so.
And of course you can post a link to where I have said that?
“Obviously he was not.”
Only a propagandist could read his words and conclde that.
Was he really? Or is it possible that hes was talking about the failed socialist revolutions which took place in Europe at that time?