The international situation which gave rise to the Monroe Doctrine was the most unusual in some respects that modern history records. The European alliance which had been organized in 1813 for the purpose of bringing about the overthrow of Napoleon continued to dominate the affairs of Europe until 1823. This alliance, which met at the Congress of Vienna in 1815 and held later meetings at Aix-la-Chapelle in 1818, at Troppau in 1820, at Laybach in 1821, and at Verona in 1822, undertook to legislate for all Europe and was the nearest approach to a world government that had ever been tried. While this alliance publicly proclaimed that it had no other object than the maintenance of peace and that the repose of the world was its motive and its end, its real object was to uphold absolute monarchy and to suppress every attempt at the establishment of representative government. As long as England remained in the alliance her statesmen exercised a restraining influence, for England was the only one of the allies which professed to have a representative system of government. As Castlereagh was setting out for the meeting at Aix-la-Chapelle Lord Liverpool, who was then prime minister, warned him that, "The Russian must be made to feel that we have a parliament and a public, to which we are responsible, and that we cannot permit ourselves to be drawn into views of policy which are wholly incompatible with the spirit of our government." The reactionary spirit of the continental members of the alliance was soon thoroughly aroused by the series of revolutions that followed one another in 1820. In March the Spanish army turned against the government of Ferdinand VII and demanded the restoration of the constitution of 1812. The action of the army was everywhere approved and sustained by the people and the king was forced to proclaim the constitution and to promise to uphold it. The Spanish revolution was followed in July by a constitutional movement in Naples, and in August by a similar movement in Portugal; while the next year witnessed the outbreak of the Greek struggle for independence. Thus in all three of the peninsulas of Southern Europe the people were struggling for the right of self-government. The great powers at once took alarm at the rapid spread of revolutionary ideas and proceeded to adopt measures for the suppression of the movements to which these ideas gave rise. At Troppau and Laybach measures were taken for the suppression of the revolutionary movements in Italy. An Austrian army entered Naples in March, 1821, overthrew the constitutional government that had been inaugurated, and restored Ferdinand II to absolute power. The revolution which had broken out in Piedmont was also suppressed by a detachment of the Austrian army. England held aloof from all participation in the conferences at Troppau and Laybach, though her ambassador to Austria was present to watch the proceedings.