(5) A final consequence of war among human groups has been the absorption of weaker groups and the growth of larger and larger political groups, until in modern times a few great nations dominate the population of the whole world. That this was not the primitive condition, we know from human history and from other facts which indicate the disappearance of a vast number of human groups in the past. The earth is a burial ground of tribes and natrons as well as of individuals. In the competition between human groups, only a few that have had efficient organization and government, loyal membership and high standards of conduct within the group, have survived. The number of peoples that have perished in the past is impossible to estimate. But we can get some inkling of the number by the fact that philologists estimate that for every living language there are twenty dead languages. When we remember that a language not infrequently stands for several groups with related cultures, we can guess the immense number of human societies that have perished in the past in this intergroup competition. Even though war passes away entirely, nations can never escape this competition with one another. While the competition may not be upon the low and brutal plane of war, it will certainly go on upon the higher plane of commerce and industry, and will probably be on this higher plane quite as decisive in the life of peoples in future as war was in the past. While the primary struggle within the human species has been in the historic period between nations and races, this is not saying, of course, that struggle and competition have not gone on within these larger groups. On the contrary, as has already been implied, a continual struggle has gone on between classes, first perhaps of racial origin, and later of economic origin. Also there is within the nation a struggle between parties and sects, and sometimes between "sections" and communities. Usually, however, the struggle within the nation is a peaceful one and does not come to bloodshed. Again, within each of these minor groups that we have mentioned struggle and competition in some modified form goes on between its members. Thus within a party or class there is apt to be a struggle or competition between factions. There is, indeed, no human group that is free from struggle or competition between its members, unless it be the family. The family seems to be so constituted that normally there is no competition between its members,--at least, there is good ground tor believing that competition between the members of a family is to be considered exceptional, or even abnormal.