Many reasons. Here are a few.
The allied forces reached Paris in 1814, before Napoleon's brief rise over the 100 days return from Elba, until his final fall at Waterloo in 1815.
Joseph Bonaparte.
Spain
Spain,prussia
Tropical disease weakened French forces.
At the height of his power in 1812, Napoleon controlled all of continental Europe from Spain in the west to Moscow (Russia) in the east, from the North Sea to the Italian states in the south. Much of this control was of course precarious, with only a single major defeat needing to happen in order for Napoleon's grip to start slipping.
To Conquer Spain.
Spain.
spain
no
Hitler
spain
Spain
Francisco Goya was the romantic artist who was in Spain when Napoleon overthrew the Spanish government. He also painted the portrait of Joseph Bonaparte, the older brother of Napoleon Bonaparte.
Trafalgar
Napoleon Bonaparte did not successfully gain Russia, Spain, or Great Britain. He did not invade Britain because they were allies after signing a peace treaty. He didn't invade Spain because he was expanding west. He tried to invade Russia, but failed, making France lose EVERYTHING.
Spain
Napoleon