when for a wanked usa to fight napoleon

When would be the best time in terms of gains for a wanked US (they have the Maritimes and a strong army/navy) to join the fight against napoleon instead of Britain
 
The U.S. may well have gone to war against France if the talks that led to the Louisiana Purchase had broken down. Jefferson was extremely nervous about Napoleonic France controlling New Orleans, and Napoleon did for a time dream of rebuilding France's North American empire. But the army that was supposed to take possession in Louisiana got bogged down in Haiti and collapsed there, foiling his plans and convincing him to sell the territory instead. If not for the yellow fever epidemic in Haiti in 1803, things would probably have gone very differently.
 
At least as important as the haïtian failure was the coming war against the UK in 1803.

Confronting the young USA in north America in order to build a new french colonial empire was coherent with peace in Europe.

It was no longer coherent when war against the UK had become unavoidable.
 
Good luck with the Jackson Rebellion.
That is after the war. During the war he and napoleon fight it out in Louisiana after Napoleon manages to invade the United states with a French and Spanish Navy and army, and it is on the outskirts of New Orleans that Napoleon will be defeated and killed.
 
If Nappy did declare war on the US, who would lead it? Davout vs American commanders would be hilarious.
 
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