From the German point of view, the call to German imperialism was clearly urgent, but the resources of German imperialism were seriously limited. The colonial ventures of the Empire had culminated in no outstanding successes and in some outstanding failures. Entering the lists late, the Germans had found the spoils of colonial rivalry almost completely appropriated by those other knights errant of white civilization, French, British, and Russian empire-builders. The few African and Asiatic territories which the Germans did succeed in acquiring were extensive in size, but unpromising in many other respects. With the exception of German East Africa the colonies were comparatively poor in the valuable raw materials so much desired by the factories of the mother country; they were unimportant as producers of foodstuffs. Attempts to induce Germans to settle in these overseas possessions were singularly unsuccessful. On the other hand, colonial enterprises had involved the empire in enormous expenditures aggregating over a billion marks; had precipitated a series of wars and military expeditions costing the nation thousands of lives and creating a host of international misunderstandings; had won for Germans widespread notoriety as poor colonizers, as tactless and autocratic officials, as ruthless overlords of the natives. It was no wonder that the German people seemed to be thoroughly discouraged and discontented with their colonial ventures. However, even had the German colonies been richer than they were, they, alone, could not have solved the imperial problem of an industrialized Germany. German colonial trade was possessed of the same inherent weakness as German overseas commerce—it would be dependent, in the event of a general European war, upon British sea power. German industry could be effectually crippled by interruption of the flow of essential raw materials, such as cotton and copper, or by the cutting of communications with her foreign markets. It was questionable whether the German navy could be relied upon to keep the seas open. Blockades, furthermore, exist not only in time of war, but in time of peace as well. European nations were surrounded by tariff barriers which seriously restricted the development of international trade and served to promote a system of national economic exclusiveness—a condition of affairs which harmonized only too well with the existing colossal military establishments. In this respect, of course, Germany was more sinner than sinned against. But in such an age it behooved every nation to build its industries, as well as its armies, with some view to the contingencies of war.