What was the Union Blockade? A A tall wall built along the Mason-Dixon Line
B A wall with spikes used to defend forts
C A type of shield used by Union troops
D A battle strategy used by Union generals to constrict the Confederate forces

D

Explanation:

the plan was called the Anaconda plan, and its aim was to keep the south from trading and selling its cotton to fund the war, and to keep the south from looking like a worthy opponent to the US to avoid foreign conflict.

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the answer is title i subtitle b

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