They seized "federal fortifications" that were on STATE soil. Have you ever heard of "imminent domain?"
Secessionsts violated the US Constitution by forming a confederacy which is strictly prohibited by the US Constitution.
No where in the Constitution did it forbid secession, in deference to what the Lincoln-lovers want to believe.
The highlight of southern gentlemanly tactics was to shoot Abe Lincoln in the back.
Considering that Lincoln turned his back to the Constitution, where else would he have been shot? (/sarcasm)
You can't show in the record that President Lincoln violated the Constitution.
Walt