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By supporting the Confederates.
They were wanting influence in Mexico, and it would have suited them to have a new nation, pro-French, in between Mexico and the US.
Lincoln trumped them with his Emancipation Proclamation, officially turning the war into a crusade against slavery, so that free nations abroad could not aid the Confederates without looking pro-slavery themselves.
Britain and France were not involved in the American Civil War. The Confederacy asked for Britain's help but they did not get involved.
Both sides in the Spanish Civil War received aid from outside Spain. France did not receive aid during or as a result of the Spanish Civil War.
The north
Poor sanitation conditions was the primary cause of most of the diseases during the American Civil War.
They supported both sides during the war