Of course not. Are you saying all ports were southern ports? Did anyone tell New York?
But according to your numerous posts on the subject, Southern consumers accounted for somewhere between 75% and 87% of the tariff revenue. In April 1861 that revenue stopped. U.S. tariff revenue in 1860 was, if I recall correctly, roughly $50 million dollars. By your sources that amount should have dropped to somewhere between $12.5 million and $6.5 million. Yet it grew exponentially, even with a protective tariff meant to discourage imports rather than encourage them. So who was buying all those imports? And why didn't they buy them before the war?