The North had such an overwhelming advantage in naval power that its blockade of the South was completely effective from the start.

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The North's blockade of the South, known as the Anaconda Plan, took time to become effective. Initially, the Union Navy did not have enough ships to enforce a complete blockade over the extensive Southern coastline, which included 3,500 miles of shoreline and numerous ports. It was only as the war progressed and the Union Navy expanded that the blockade became more effective in cutting off supplies to the Confederacy.

The North Had Such an Overwhelming Advantage in Naval Power