The Pew Research Center has released a new report on the effects of immigration upon national demographics. It reports that in 2050, under current immigration rates, 19% of the total US population will be immigrants, well above the "historic peaks for immigrants as a share of U.S. population" (nearly 15% in 1890 and 1910). It also includes some demographic models for the US in 2050 if the immigration rate increases or decreases.