Analysis of information sources in references of the Wikipedia article "Imperium kolonial Jepang" in Indonesian language version.
In all the ameliorating conditions every one must rejoice; but when these are coupled with the old-time lack of self-control leading to universal early marriages, a problem is rolling up before which Japanese statesmen are appalled. At the present rate of increase there will, before the middle of this century, be a hundred million people to provide for. It Is this prospect which is leading Japanese statesmen to make such frantic efforts to secure opportunity for colonization. Being practically shut off from going to other foreign countries, and Formosa being already largely occupied, Japan would naturally look to Korea and Manchuria; but of these places Korea would afford only partial relief, both because of its limited area and of its present population. The northern region of Manchuria, however, is still almost as much in a state of nature as were the prairies of the Mississippi valley when the Indians roamed freely over them.
