What was the powerful political idea of 1800 that upset balance power in Europe?

The powerful political idea of 1800 that upset balance power in Europe was Napoleon's desire for expansion and domination. His conquests and attempts to control neighboring countries threatened the existing balance of power in Europe, which had been maintained by a series of alliances and treaties. Napoleon's actions led to the formation of coalitions against him, eventually leading to his defeat at the Battle of Waterloo in 1815.