Well, let's see. Tennessee passed a secession ordinance in June, 1861, right?
Federal troops were in Nashville in April, '62. That's less than a year. And they had held Memphis for months previous to that.
And when did Grant sack Jackson, MS?
And federal troops were outside Charleston very early, and on the barrier islands in NC and Georgia too.
And how many exports did the rebel states have? Or imports?
I think the outhouse republic in Texas a few years ago did about as well.
Walt