TERRITORIAL gains by conquest often seem to require that the frontiers shall again and again be extended further afield. Japan's expansion on the continent of Asia, which she has sought to justify on the grounds of security, is a case in point.
Since 1905 Japan has extended her possessions and influence by an almost continuous process. Her most recent moves in Inner Mongolia and in the northern part of China proper are an integral part of this process. But they differ in method from the action taken in 1931 and 1933 in Manchuria and Jehol, where control was won by armed force. In
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