[lawtguy]

Looking at the US Census data from 1850 onward (they didn't ask where you were born before the 1850 census), the percentage of the US population was a steady 13-14% from 1860 to 1920. In 1950 (they didn't ask in 1930 or 1940), it's down to 9% presumably from the changes in immigration law in the 1920s. Then it's around 5% for 1960-1980 and from 1990 starts to rise up to 12.48% today. That's roughly where the percentage of immigrants was for the 6 decades before 1920. That doesn't to me look like "an unprecedented experiment with extraordinarily high immigration"

[rubashov]

Despite reaching replacement level fertility in the 70s, the population has continued to explode, and this is due entirely to immigration. This is historically unprecedented.

http://www.numbersusa.com/content/learn/sustainability/bigge...