Metternich kept peace in Europe for a long time, but there were still some revolts in Europe. Finally in 1848, many revolts happened at the same time. One of them was in Austria, and the rebels had Metternich taken out of office. After he was gone, Otto von Bismarck in Prussia managed to become powerful, take over the German Confederation and start a big German country, which still exists. Having one big Germany, however, upset Metternich's balance and helped to cause World War I.