[bigbob]

No. It was a rejection by southern states of the government of the United States. That’s why they called their new country the Confederate States of America.

The author is exactly right.

[Svartalfiar]

The author is exactly right.

No, the author is still completely wrong. There was no government overthrow, unless you count the Confederacy being dissolved, though that was from external conquest. The Southern states simply left. The 'Civil War' was to force them back in.