Was the union's naval blockade of the south successful? why or why not?

During the Civil War, Union forces established a blockade of Confederate ports designed to prevent the export of cotton and the smuggling of war materiel into the Confederacy. ... By July of 1861, the Union Navy had established blockades of all the major southern ports.

Opposition to the nra came to a head in 1935, when the conservative supreme court declared the agency unconstitutional, claiming the nra gave the executive branch regulatory powers that belonged exclusively to congress. this decision began a series of court decisions that overturned key elements of the new deal.