"Ranke had faith in the capacity of the great powers to strike a balance with one another, and thereby to avoid that dominance of one continental power over all the others which Napoleon had all but achieved. His faith was not misplaced. Between 1814 and 1907 there were seven congresses (of sovereigns or premiers) and nineteen conferences (of foreign ministers) at which the principal diplomatic issues were discussed and, in large measure, settled. Though lacking all the institutional trappings of the international order of our own time, these regular summits in fact performed a role not so very different from that played today by the permanent members of the United Nations Security Council. The treaties they signed and agreements they brokered did not prevent war, but they limited it, so that no European crisis in the hundred years between the Congress of Vienna and the assassination at Sarajevo escalated into a full-scale conflict involving all the great powers. This was no small achievement."