Congress of Vienna: A conference held in 1814-1815 among European powers after Napoleon's defeat at Waterloo, aimed at restoring stability and redrawing boundaries in Europe.
Balance of Power: The idea that no single nation should dominate others, resulting in a distribution of political and military strength among different countries.
Nationalism: A strong sense of loyalty or devotion to one's own nation or ethnic group, often leading to movements for self-determination or independence.