The Union blocked Georgia's coast and this was terrible if you were a confederate soldier, plantation owner, or anyone else in the south because of money. if the south had no more supplies or food or whatever, all that they needed to do was get some cotton, the south's primary economy source, and export it to some foreign country like France or something and they would get money to buy whatever they needed like ammunition or clothing. But what would happen if the seaports were closed and there was no way to import/export things?
Well, the Confederacy would have to live with what they have and that was dangerous because all the whole state would have been in danger and not only would the soldiers be in trouble, but the whole state was in danger and that was dangerous. It was kind of like total war.
http://whitearborbridal.com/home2313/wp-content/uploads/2013/08/closed.png