as full vigor as if she had still a practical hold over her colonies and a navy to enforce her pretensions, "no man will say that under such circumstances our recognition of those states can be indefinitely postponed."[48] While Great Britain was thus considering the expediency of following the example of the United States in the recognition of Spain's revolted colonies, the powers of central Europe had taken upon them the task of solving the difficulties of that unfortunate country both at home and in America. The restored rule of the Bourbons in Spain had been far from satisfactory to the great mass of the people. In March, 1820, the army which Ferdinand had assembled at Cadiz to be sent against the rebellious colonies, suddenly turned against the government, refused to embark, and demanded the restoration of the constitution of 1812. The action of the army was everywhere approved and sustained by the mass of the people, and the king was forced to proclaim the constitution and to swear to uphold it. The March revolution in Spain was followed in July by a constitutional movement in Naples, and in August of the same year by a similar movement in Portugal; while the next year saw 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 movement in Greece was, it is true, of an altogether different character from the others, but it was a revolt against constituted authority and therefore incurred the ill-will of the so-called legitimists. The powers of Europe 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. The principle of joint intervention on the part of allied governments in the internal affairs of European states had been developed in the years immediately following the overthrow of Napoleon and was the outcome of the wholly anomalous condition in which he had left the politics of Europe. In the hands of Prince Metternich, the genius of reaction against French revolutionary ideas, this principle had become the most powerful weapon of absolutism and now threatened the subversion of popular institutions throughout Europe.