Pity. Because that's exactly what has damaged the cause of States' Rights ever since. Of course sovereign states may secede from a Union. Unfortunately, the main reason why the South wanted to secede was to preserve ... and perhaps extend ... slavery.
Mention the term "States' Rights" today and you will be called a racist. However, if the federal government fails to live up to its obligations, or intrudes into state matters, what other choice do the people of a sovereign state have? It's either secede, or armed rebellion, which are not the same thing.
Slavery probably could have been ended in a variety of ways, without war, as was done in other countries. E.G., witness the many plans to buy the slaves using bond issues, etc., free them, and send them to other countries. Actually done in a very small way!
What’s your point? The north denied freedom of self determination to white Southerners, you know, like slave owners.