But this "Concert of Europe" was the very thing against which the democratic forces on the continent finally rebelled, for the "Concert" took the form of the so-called "Holy Alliance" between the rulers of Europe, whose object was to prevent popular movements from disturbing the neat and orderly peace which they had created. The system created by the Congress of Vienna began to break down in 1848. Since then the warlike nationalist and democratic movements in Europe, followed by the tremendous economic growth of the European nations, have made it almost impossible to secure any stable balance of power, though a more or less successful attempt to establish such a balance in the affairs of south-eastern Europe was made at the Congress of Berlin in 1878. The two Hague Conferences of 1899 and 1907 did little but reveal the mutual fears and suspicions of the European nations, though many statesmen, especially English and American, laboured sincerely to make the Hague Conventions the guarantee of a lasting peace. But it must be observed that the "Balance of Power," which was originally a distinctly European conception, has now become a world-wide conception. In order to secure a balance of power between the European States it is no longer sufficient to settle European frontiers; it is necessary to settle and, as it were, dovetail into each other the economic interests of the European countries in Africa, Asia, and the Southern Pacific. It is also necessary to define the relations of European countries to the States in North and South America.