i.e. loss of territory and resources.
You just answered your own question... If they were to sink all our warships.
Noted. No they didn't; nor did they want the South using the slave labor in the expanding US territory. AGAIN, I note, territory.
Fort Sumpter was the first military action of the civil war; commenced by the Confederate South.
Well, war is war-- once waged, victory ~ unconditional surrender of your opponent becomes the objective. The emancipation proclamation was invoked for military purposes IMO-- the Union needed soldiers, freemen served. I'd mentioned this earlier, but newly freed blacks of the confederate south were the only slaves freed. Union states' slaves would have to wait until after the war to become free.
Entitled-- as in, they have the right? NO. Besides, it'd be a suicide mission. But they've a history of instigating bloodshed over trivial matters, so I wouldn't put it past them.
Well the SCOTUS case after the war left state political action and war as the means of leaving the Union, not unilateral diplomatic secession. It all hinges on what makes a more perfect union IMHO. Is it more perfect to have a state unilaterally secede, or require them to have the remaining states endorse/capitulate upon the disenfranchised states' demands?