Why was the union blockade so harmful to the confederacy?

During the Civil War, the Union attempted to blockade the southern states. A blockade meant that they tried to prevent any goods, troops, and weapons from entering the southern states. By doing this, the Union thought they could cause the economy of the Confederate States to collapse.

The Union blockade in the American Civil War was a naval strategy by the United States to prevent the Confederacy from trading.

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