What can be concluded from the Union's desire to blockade ports in the South?

a. The Union navy was large and effective.
b. Southern port cities were also industrial centers.
c. Foreign nations were willing trade partners with the Confederacy.
d. No foreign nations were willing to assist the Confederacy.

What can be concluded from the Unions desire to blockade ports in the South a The Union navy was large and effective b Southern port cities were also industrial class=