What Did Klemens Von Metternich And Alexander I Proclaim At The Troppau Conference In 1820?

What Did Klemens Von Metternich And Alexander I Proclaim At The Troppau Conference In 1820? What did Klemens von Metternich and Alexander I proclaim at the Troppau Conference in 1820? to institute the principle of active intervention to maintain all autocratic regimes whenever they were threatened. Which reform did France’s Second Republic Institute in 1848?