The correct answer is A) the Union blockade.
One of the most successful plans of the Union during the Civil War was the Union blockade.
Among the plans and decisions of the Union army that was most successful, without a doubt was the Union blockade the Confederate ports.
The Union blockade during the Civil War was a successful decision by the Union Army in that it caused inflation and shortages in the South, such as manufactured goods. The union blocked Confederation Ports to prevent the export of Cotton and the import of war supplies that could benefit the Confederated Army. The blockade was successful, but the Confederates found ways to smuggle cotton and weapons through other parts like Mexico.
