Diverse as are the causes that induce emigration and invite immigration, the most fundamental of all, with the exception of a few extraordinary cases, such as that of the Pilgrim Fathers, is economic pressure. There is a close relationship--a mutual give and take--between the immigrants and those who receive them. Generally speaking, human activities have their main-spring in man's desire to improve his conditions of living. The motive which induces the people of one country to go out and settle in another country is the same as the motive which induces another people to invite immigrants from other countries. True, in the former case, the direct reason for the move is generally the overcrowding and poor natural environment at home. In the latter case, it is the lack of man-power and the presence of great unexploited natural resources. But in both cases the real motive is the pursuit of interest, which may be reciprocally promoted by the transaction. It is well to keep this point clearly in mind at the outset, because much of the confusion in discussing the Japanese problem in California arises from forgetting the real cause which brought Japanese immigrants to America and which induced America to invite them. During the early colonial period the American colonies invited refugees from political and religious oppression to come and settle in the new world of freedom and democracy. The remnant of this early spirit still remains embodied in the present immigration laws of the United States. Nevertheless, it is almost a dead letter, with great historic interest but with no practical significance. The real motive for welcoming immigrants has been the acquisition of man-power for the exploitation of vast natural resources and for the development of industry. This is a fact which may be observed in almost all "new worlds," including the South American republics, Canada, and Australia, where the dearth of human energy is the capital reason of slow economic development. With settlers, however, the economic motive is not the only one, though it is predominant. Here the motives are diverse and complicated. With the Japanese there are particular causes which have been driving them to seek opportunities in new worlds. Japan's Land Area.