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Before inquiring as to general changes in our national condition which may justify a change of opinion and policy in this respect, let us deal briefly, as we must, with two opinions regarding the immigration of the past, which stand in the way of any fair consideration of the subject. These two opinions were, first, that immigration constituted a net reinforcement of our population; secondly, that, in addition to this, or irrespective of this, immigration was necessary, in order to supply the laborers who should do certain kinds of work, imperatively demanded for the building up of our industrial and social structure, which natives of the soil were unwilling to undertake.

The former of these opinions was, so far as I am aware, held with absolute unanimity by our people; yet no popular belief was ever more unfounded. Space would not serve for the full statistical demonstration of the proposition that immigration, during the period from 1830 to 1860, instead of constituting a not reinforcement to the population, simply resulted in a replacement of native by foreign elements; but I believe it would be practicable to prove this to the satisfaction of every fair-minded man. Let it suffice to state a few matters which are beyond controversy.

The population of 1790 was almost wholly a native and wholly an acclimated population, and for forty years afterwards immigration remained at so low a rate as to be practically of no account; yet the people of the United States increased in numbers more rapidly than has ever elsewhere been known, in regard to any considerable population, over any considerable area, through any considerable period of time. Between 1790 and 1830 the nation grew from less than four millions to nearly thirteen millions, -- an increase, in fact, of two hundred and twenty-seven per cent, a rate unparalleled in history. That increase was wholly out of the loins of our own people. Each decade had seen a growth of between thirty-three and thirty-eight per cent, a doubling once in twenty-two or twenty-three years. During the thirty years which followed 1830, the conditions of life and reproduction in the United States were not less, but more favorable than in the preceding period. Important changes relating to the practice of medicine, the food and clothing of people, the general habits of living, took place, which were of a nature to increase the vitality and reproductive capability of the American people. Throughout this period, the standard of height, of weight, and of chest measurement was steadily rising, with the result that, of the men of all nationalities in the giant army formed to suppress the slaveholders' rebellion, the native American bore off the palm in respect to physical stature. The decline of this rate of increase among Americans began at the very time when foreign immigration first assumed considerable proportions ; it showed itself first and in the highest degree in those regions, in those States, and in the very counties into which the foreigners most largely entered. It proceeded for a long time in such a way as absolutely to offset the foreign arrivals, so that in 1850, in spite of the incoming of two and a half millions of foreigners during thirty years, our population differed by less than ten thousand from the population which would have existed, according to the previous rate of increase, without reinforcement from abroad. These three facts, which might be shown by tables and diagrams, constitute a statistical demonstration such as is rarely attained in regard to the operation of any social or economic force.

But it may be asked, Is the proposition that the arrival of foreigners brought a check to the native increase a reasonable one? Is the cause thus suggested one which has elsewhere appeared as competent to produce such an effect? I answer, Yes. All human history shows that the principle of population is intensely sensitive to social and economic changes. Let social and economic conditions remain as they were, and population will go on increasing from year to year, and from decade to decade, with a regularity little short of the marvelous. Let social and economic conditions change, and population instantly responds. The arrival in the United States, between 1830 and 1840, and thereafter increasingly, of large numbers of degraded peasantry created for the first time in this country distinct social classes, and produced an alteration of economic relations which could not fail powerfully to affect population. The appearance of vast numbers of men, foreign in birth and often in language, with a poorer standard of living, with habits repellent to our native people, of an industrial grade suited only to the lowest kind of manual labor, was exactly such a cause as by any student of population would be expected to affect profoundly the growth of the native population. Americans shrank alike from the social contact and the economic competition thus created. They became increasingly unwilling to bring forth sons and daughters who should be obliged to compete in the market for labor and in the walks of life with those whom they did not recognize as of their own grade and condition. It has been said by some that during this time habits of luxury were entering, to reduce both the disposition and the ability to increase among our own population. In some small degree, in some restricted localities, this undoubtedly was the case; but prior to 1860 there was no such general growth of luxury in the United States as is competent to account for the effect seen. Indeed, I believe this was almost wholly due to the cause which has been indicated, -- a cause recognized by every student of statistics and economics.