(A) Confederate raids on northern shipping.
(B) transportation of rebel troops and supplies on steamboats
(C) ** Union blockade of the Confederate coast.
(D) ironclad ships that appeared during the war.
EXPLANATIONS BELOW
Concept note-1: -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.
Concept note-2: -The Union blockade in the American Civil War was a naval strategy by the United States to prevent the Confederacy from trading.
Concept note-3: -Throughout the American Civil War, blockade runners were seagoing steam ships that were used to get through the Union blockade that extended some 3, 500 miles (5, 600 km) along the Atlantic and Gulf of Mexico coastlines and the lower Mississippi River.
Concept note-4: -The North controlled the sea at all points during the war” (Tucker, 11). The suffocating Union blockade helped choke off the Confederacy from the outside world and stifled its attempts to export cotton. This greatly impacted the Confederate economy as cotton became its primary export by 1861.