76 THE SHADOW OF THE WORLD’S FUTURE Such a fact concentrates one’s attention upon the nature of the right of occupation of territory. This right of occupation may be regarded from two points of view, one concerning itself with the legal aspect merely, the other concerning itself with the moral aspect, or what may be called the right of the occupants to hold the territory as against all comers, and equitably so from an international or world standpoint. In this connection it is well to bear in mind that, from the widest standpoint, and also from the point of view of a people with insufficient territory for their maintenance and development, the right of the occupants of all territories tends to be regarded, at least by those in overcrowded countries, as rela- tive rather than absolute. And one of the principal measures of the relative right will naturally, and perhaps justly, be conceived to be the effectiveness of occupation. This, however, has to be broadly under- stood, as we shall see later. Throughout the world’s history, civilised peoples have gone into other countries and have replaced inferior and barbaric peoples. Sturdy, vigorous and informed races have possessed themselves of territories occupied by peoples who do not possess such attributes in the same degree. Recent examples are the United States, South Africa, and Australia. This is a world- advantage. Wherever the population-density is relatively slight, and that of near countries or regions is relatively great, the condition exists to bring into sharp prominence the issue of migration. The impulsion is reinforced when one of the countries is decidedly over-populated and the other is as obviously under-populated, and particularly so when they are near to one another. Whether such world-conditions are agreeable or not, this is the fact, and it would be fatuous not to keep it in view, a matter which will now be considered.