To the unquestionable titles by which they acquired their crowns--titles by which the pride of nation or of race was not wounded--and to the more or less perfect preservation, in each state, of its national institutions and privileges--to the enjoyment by each people of their laws, their language, customs, and prejudices--the princes of the house of Hapsburg owed the allegiance of subjects who had little else in common. There, as elsewhere in continental Europe, the sovereign long continued to encroach upon the rights of his subjects, and at length usurped an authority not recognised by the laws of his different possessions, or consistent with the conditions on which he had received their crowns. These usurpations were frequently resisted, and not unfrequently by force of arms. Belgium asserted her independence, and was permanently separated from Austria. But, in such contests, the sovereign of many separate states had obvious advantages. His subjects, divided by differences of race, language, religion, and sentiment, were incapable of combining against him; and however solicitous each people might be to preserve their own liberties and privileges, they were not prepared to resist encroachments on those of a neighbouring people, for whom they had no friendly feeling. The Austrians and Italians were ready to assert the emperor's authority in Hungary or Bohemia, the Hungarians and Bohemians to put down resistance in Lombardy. Even in the same kingdom the races were not united. In Hungary, the Sclave was sometimes ready to aid the emperor against the Majjar, the German against the Sclave. The disunion which was a source of weakness to the empire was a source of strength to the emperor. Partly by compulsory changes, effected according to constitutional forms, partly by undisguised usurpations, in which these forms were disregarded, the emperors were thus enabled to extend the prerogative of the crown, to abridge the liberties of their subjects in each of their possessions, and, in some of them, to subvert the national institutions.