Napoleon experiences another defeat against Great Britain in Waterloo. As a result, Napoleon quickly loses power as emperor and is dethroned. He died a few years later.
The Congress of Vienna was formed by European conservatives wishing to restore the monarchies in Europe. The Congress of Vienna focused on creating and maintaining a balance of power within Europe, as well as strengthening countries around France to ensure no future revolts.
Because European leaders had become anxious about the legacy of the French Revolution, Prussia, Russia, and Austria formed a Holy Alliance in which they pledged to strengthen countries surrounding France in order to combat the forces of revolution.