[fortheDeclaration]

The election of a tyrannical President that 1/2 of the country didn't even have on the ballot is a good reason, and quite the emergency.

The election was constitutional.

Lincoln was not on the ballot because the Southern states would not allow a 'black' Republican on it.

Still, since the South divided the Democrat Party over slavery (not Tariffs), they were doomed to have Lincoln elected (as well as the Republican Party)

And once South Carolina seceded, Ft. Sumter was THEIR property

No, Federal property is property, owned by all the states.

[MacDorcha]

"No, Federal property is property, owned by all the states."

Mostly correct. Now, what happens when the kid with all the toys goes home?

By leaving, the South dropped all ties to the Union. The Union kept an active fort on SC soil. This made it subject to the state it was in (who claimed no "federal" connection to it)

[TexConfederate1861]

Not when it is located within the borders of another sovereign nation.