How immigration in U.S. has shifted through times

Really informative interactive map from the Pew Research Center charting where immigrants came from, and their total U.S. population, in each decade from 1850 to 2013. For instance, did you know that the most common nation of origin for immigrants to South Dakota in 2013 was Ethiopia? California's top originating nation early in 1870 was Ireland, then in 1880 it was China. The data for 1890 was lost in a 1921 fire. Mexico did not become the top nation of origin for California until 1930. Look at the current spread of immigration from Mexico across the U.S.