To call the Southern states 'invading states' is incorrect because while they did trespass on federal property at Sumter it was not an invasion. One invades other countries, not part of one's own. "Screwor" or "screwee" is also confusing. When you are talking about the Screwee then are you talking about the remaining states, left with debt, treaty obligations and suffering the loss of property stolen by the South? Or are you talking about Texas and their complaints about federal inaction they suffered when Southern Democrats ran Congress? It's just too hard to keep track. No, I truly believe that 'rebelling states' is still the most accurate description.
That would be a legitimate policy basis for going out of the Union, and in fact the Texans mention it a lot, as you can see.
It's amazing that Texas suffered in silence for so long and only chose to rebel once a president with a stated policy against the expansion of slavery was elected. I guess their patience just plumb wore out, huh? </sarcasm>
Well, it might have been the Wide Awakes who were running around Texas, trying to burn the place down and start a slave rising.
That would tend to piss people off.