of each of the nations which have shared in this vast achievement. [1] See the first essay in Nationalism and Internationalism, in which an attempt is made to work out this idea. Four main motives can be perceived at work in all the imperial activities of the European peoples during the last four centuries. The first, and perhaps the most potent, has been the spirit of national pride, seeking to express itself in the establishment of its dominion over less highly organised peoples. In the exultation which follows the achievement of national unity each of the nation-states in turn, if the circumstances were at all favourable, has been tempted to impose its power upon its neighbours,[2] or even to seek the mastery of the world. From these attempts have sprung the greatest of the European wars. From them also have arisen all the colonial empires of the European states. It is no mere coincidence that all the great colonising powers have been unified nation-states, and that their imperial activities have been most vigorous when the national sentiment was at its strongest among them. Spain, Portugal, England, France, Holland, Russia: these are the great imperial powers, and they are also the great nation-states. Denmark and Sweden have played a more modest part, in extra-European as in European affairs. Germany and Italy only began to conceive imperial ambitions after their tardy unification in the nineteenth century. Austria, which has never been a nation-state, never became a colonising power. Nationalism, then, with its eagerness for dominion, may be regarded as the chief source of imperialism; and if its effects are unhappy when it tries to express itself at the expense of peoples in whom the potentiality of nationhood exists, they are not necessarily unhappy in other cases. When it takes the form of the settlement of unpeopled lands, or the organisation and development of primitive barbaric peoples, or the reinvigoration and strengthening of old and decadent societies, it may prove itself a beneficent force. But it is beneficent only in so far as it leads to an enlargement of law and liberty. [2] Nationalism and Imperialism, pp. 60, 64, 104.