The statistics of the economic interdependence of Germany and her neighbors are overwhelming. Germany was the best customer of Russia, Norway, Holland, Belgium, Switzerland, Italy, and Austria-Hungary; she was the second best customer of Great Britain, Sweden, and Denmark; and the third best customer of France. She was the largest source of supply to Russia, Norway, Sweden, Denmark, Holland, Switzerland, Italy, Austria-Hungary, Roumania, and Bulgaria; and the second largest source of supply to Great Britain, Belgium, and France. In our own case we sent more exports to Germany than to any other country in the world except India, and we bought more from her than from any other country in the world except the United States. There was no European country except those west of Germany which did not do more than a quarter of their total trade with her; and in the case of Russia, Austria-Hungary, and Holland the proportion was far greater. Germany not only furnished these countries with trade, but, in the case of some of them, supplied a great part of the capital needed for their own development. Of Germany's pre-war foreign investments, amounting in all to about $6,250,000,000, not far short of $2,500,000,000 was invested in Russia, Austria-Hungary, Bulgaria, Roumania, and Turkey.[4] And by the system of "peaceful penetration" she gave these countries not only capital, but, what they needed hardly less, organization. The whole of Europe east of the Rhine thus fell into the German industrial orbit, and its economic life was adjusted accordingly. But these internal factors would not have been sufficient to enable the population to support itself without the co-operation of external factors also and of certain general dispositions common to the whole of Europe. Many of the circumstances already treated were true of Europe as a whole, and were not peculiar to the Central Empires. But all of what follows was common to the whole European system. III. _The Psychology of Society_