Roosevelt and the pride of offspring are insufficient counterweights to these inducements. Large families disappear from the States, and more and more couples are childless. Those who have children restrict their number in order to afford those they have some reasonable advantage in life. This, in the presence of the necessary knowledge, is as practically inevitable a consequence of individualist competition and the old American tradition as the appearance of slums and a class of millionaires. These facts go to the very root of the American problem. I have already pointed out that, in spite of a colossal immigration, the population of the United States was at the end of the nineteenth century over twenty millions short of what it should have been through its own native increase had the birth-rate of the opening of the century been maintained. For a hundred years America has been "fed" by Europe. That feeding process will not go on indefinitely. The immigration came in waves as if reservoir after reservoir was tapped and exhausted. Nowadays England, Scotland, Ireland, France and Scandinavia send hardly any more; they have no more to send. Germany and Switzerland send only a few. The South European and Austrian supply is not as abundant as it was. There may come a time when Europe and Western Asia will have no more surplus population to send, when even Eastern Asia will have passed into a less fecund phase, and when America will have to look to its own natural increase for the continued development of its resources. If the present isolated family of private competition is still the social unit, it seems improbable that there will be any greater natural increase than there is in France.