A Nation of Immigrants A Portrait of the 40 Million, Including 11 Million Unauthorized: "The United States is the world’s leader by far as a destination for immigrants. The country with the next largest number is Russia with 12.3 million. The U.S. total of 40.4 million, which includes legal as well as unauthorized immigrants, represents 13% of the total U.S. population in 2011. While the foreign-born population size is a record, immigrants’ share of the total population is below the U.S. peak of just under 15% during a previous immigration wave from 1890 to 1920 that was dominated by arrivals from Europe. The modern wave, which began with the passage of border-opening legislation in 1965, has been dominated by arrivals from Latin America (about 50%) and Asia (27%)."