[DarkSavant]

https://www.abbevilleinstitute.org/review/ft-sumter-the-first-act-of-aggression/

South Carolinians were becoming more and more alarmed as the weeks went on, especially due to the fact that Lincoln had delivered in his First Inaugural Address what the seceded States regarded as a Declaration of War:

No State upon its own mere motion can lawfully get out of the Union; that resolves and ordinances to that effect are legally void, and that acts of violence within any State or States against the authority of the United States are insurrectionary or revolutionary, according to circumstances.

There's plenty more in the link.

[rockrr]

What’s at the link is revisionist crap unworthy of serious review. At least now we know where you’re getting it...

[DoodleDawg]

There's plenty more in the link.

So there is, and most amusing too. If I'm reading it correctly, the gist of the article seems to be that the Confederacy really didn't want to fire on Sumter but were actually tricked/fooled/hornswoggled into it by that evil Lincoln. A convenient excuse.