They made no difference as to the results of the war. What CSA (Confederate States of America) Hunley did do; was make naval history, by sinking the first ship in a war with a sub.
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The US helped France in world war 1 with submarines in the Atlantic.
US Civil War 1861-1865.
The US Civil War was an un-declared war.
The US military draft began in the US Civil War (1861-1865).
Russia was not involved in the US Civil War. A civil war is defined as a war fought between groups which are all from one country.