Interesting claim, but it doesn't hold up. The battle of Ft. Sumpter started in April 1861. South Carolina, Mississippi, Florida, Alabama, Georgia, Louisiana, and Texas had already seceded. Only Virginia, Arkansas, North Carolina, and Tennessee waited until after the battle.
> Did he use trade embargoes like a peace seeking consolidator would?
He wasn't looking to be a piece seeking consolidator, he was looking to put down a revolt. You're welcome to make the argument that actually it would have been better realpolitik to appease the southern states. In fact, I'd love to see that argument!