"Although the major development of the fifty years after 1900 can thus be seen as the coming of a bipolar world, with its consequent crisis for the "middle" Powers (as referred in the titles of Chapters 5 and 6), this metamorphosis of the entire system was by no means a smooth one. On the contrary, the grinding, bloody mass battles of the First World War, by placing a premium upon industrial organization and national efficiency, gave imperial Germany certain advantages over the swiftly modernizing but still backward czarist Russia. Within a few months of Germany's victory on the eastern front, however, it found itself facing defeat in the west, while its allies were similarly collapsing in the Italian, Balkan, and Near Eastern theaters of the war. Because of the late addition of American military and especially economic aid, the western alliance finally had the resources to prevail over its rival coalition. But it had been an exhausting struggle for all the original belligerents. Austria-Hungary was gone, Russia in revolution, Germany defeated; yet France, Italy, and even Britain itself had also suffered heavily in their victory. The only exceptions were Japan, which further augmented its position in the Pacific; and, of course, the United States, which by 1918 was indisputably the strongest Power in the world."