On a superficial view the most obvious feature of this strenuous period was that all the remaining unexploited regions of the world were either annexed by one or other of the great Western states, or were driven to adopt, with greater or less success, the modes of organisation of the West. But what was far more important than any new demarcation of the map was that not only the newly annexed lands, but also the half-developed territories of earlier European dominions, were with an extraordinary devouring energy penetrated during this generation by European traders and administrators, equipped with railways, steam-boats, and all the material apparatus of modern life, and in general organised and exploited for the purposes of industry and trade. This astonishing achievement was almost as thorough as it was swift. And its result was, not merely that the political control of Europe over the backward regions of the world was strengthened and secured by these means, but that the whole world was turned into a single economic and political unit, no part of which could henceforth dwell in isolation. This might have meant that we should have been brought nearer to some sort of world-order; but unhappily the spirit in which the great work was undertaken by some, at least, of the nations which participated in it has turned this wonderful achievement into a source of bitterness and enmity, and led the world in the end to the tragedy and agony of the Great War. The causes of this gigantic outpouring of energy were manifold. The main impelling forces were perhaps economic rather than political. But the economic needs of this strenuous age might have been satisfied without resort to the brutal arbitrament of war: their satisfaction might even have been made the means of diminishing the danger of war. It was the interpretation of these economic needs in terms of an unhappy political theory which has led to the final catastrophe. On a broad view, the final conquest of the world by European civilisation was made possible, and indeed inevitable, by the amazing development of the material aspects of that civilisation during the nineteenth century; by the progressive command over the forces of nature which the advance of science had placed in the hands of man, by the application of science to industry in the development of manufacturing methods and of new modes of communication, and by the intricate and flexible organisation of modern finance. These changes were already in progress before 1878, and were already transforming the face of the world. Since 1878 they have gone forward with such accelerating speed that we have been unable to appreciate the significance of the revolution they were effecting. We have been carried off our feet; and have found it impossible to adjust our moral and political ideas to the new conditions.