If there was no blockade of the confederate coastline, the confederate's would have been able to get more supplies that would help them to fight back and win the war.
This would have enabled the South to win the war. This strategy that the Union army used against them was really a great cause for their loss at the war front.
The Union blocked the coastlines of the confederates in order to stop them from exporting their cotton and also to stop them from getting aids in the forms of war materials from foreign countries.
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