Next. the descendants of the first generation from those born abroad. That also is carried in the census figure and involves no uncertainty. Next. the immigration between 1790. when we took our first census. and the arrival of the parents of these children of foreignborn parents who were in the census. We have accurate immigration figures from 1820 down to date. There is involved a slight element of estimate in the ascertainment of the immigration between 1790 and 1820. But the number was limited to a comparatively few hundred thousand. There was more immigration in one single year in the nineties than there was in the whole 30 years between 1790 and 1820. Then there is involved the question of calculating the descendants of those who were included in the 1790 census. That involves care. it involves a study of the fecundity of the population at that time.
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immigration