Japan thus does not have the same vital interest as China in the Asiatic tropics. Undoubtedly they would for Japan be valuable colonies of exploitation, just as they to-day are thus valuable for white nations. But they could never furnish outlets for Japan's excess population, and even commercially Japan would be exposed to increasing Chinese competition, since the Chinaman excels the Japanese in trade as well as in migrant colonization. Japanese lack of climatic adaptability is also the reason why Japan's present military excursion in eastern Siberia, even if it should develop into permanent occupation, would yield no adequate solution of Japan's population problem. For the Chinaman, Siberia would do very well. He would breed amazingly there and would fill up the whole country in a remarkably short space of time. But the Japanese peasant, so averse to the winters of Hokkaido, would find the sub-Arctic rigors of Siberia intolerable. Thus, for Japanese migration, neither the empty spaces of northern or southern Asia will do. The natural outlets lie outside Asia in the United States, Australasia, and the temperate parts of Latin America. But all these outlets are rigorously barred by the white man, who has marked them for his own race-heritage, and nothing but force will break those barriers down. There lies a danger, not merely to the peace of the Far East, but to the peace of the world. Fired by a fervent patriotism; resolved to make their country a leader among the nations; the Japanese writhe at the constriction of their present race-bounds. Placed on the flank of the Chinese giant whose portentous growth she can accurately forecast, Japan sees herself condemned to ultimate renunciation of her grandiose ambitions unless she can somehow broaden the racial as well as the political basis of her power. In short: Japan must find lands where Japanese can breed by the tens of millions if she is not to be automatically overshadowed in course of time, even assuming that she does not suffocate or blow up from congestion before that time arrives. This is the secret of her aggressive foreign policy, her chronic imperialism, her extravagant dreams of conquest and "world-dominion."