The Anaconda Plan was used by the union to suck the life out of the south. They would use the army and the navy to take over all southern ports and not let anything in or out which would cause the economy of the south to be ruined. They also used thenavy to take control of the Missisippi river so they could cut the confederacy into 2 pieces.
Civil War print - General Winfield Scott - The Anaconda Plan
Union forces started a blockade of Southern ports in order to stop the exporting of cotton and prevent the imports of materials to help the South. The idea of blockading was formed after the attack on Fort Sumter. This was all a small part of the Anaconda Plan.