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The most important port was Ostia as it was the nearest major port to Rome itself.
calais
Mobile
Wilmington NC
Marseille
Wilmington NC
Wilmington NC
Charleston, SC New Orleans, LA Galveston, TX (for awhile)
Alexandria, Egypt.
this was the souths most important cotton market port
Because Confederate leaders realized that the war effort would suffer a serious blow if Galveston, the state's busiest seaport, remained in the union's hands.
Most records cite the fall of Wilmington, North Carolina on February 22, 1865. This was the last blockade running port of the South.