Conversation so far:
What are the Napoleonic Wars?
The Napoleonic Wars were a series of major conflicts pitting the French Empire and its allies, led by Napoleon I, against a fluctuating array of European powers.
When did the Napoleonic Wars take place?
The Napoleonic Wars took place from 1803 to 1815.
Who was involved in the Napoleonic Wars?
The French Empire and its allies against European powers formed into various coalitions, financed and led by the United Kingdom, were the members involved in the Napoleonic Wars.
Was anyone else not already mentioned involved in the Napoleonic Wars?
No.

Question: Why did the wars start?
Self-contained rewrite: Why did the Napoleonic Wars start?