Due to declining fertility rates and increased numbers of immigrants, legal foreign immigration now comprises 1/4 of the US's annual population growth. This article uses 1900-1979 Immigration and Naturalization Service data on immigrants' intended destination to examine immigration policy and its effect on immigrants and the American people. From the US's beginnings to the 1880s, immigrants came mainly from Great Britain, Germany, and other Northern and Western European countries, in the 1890s; over 70% of immigrants came from Italy, Austria, Hungary, Russia, and Germany. Immigration had peaked at over 1 million persons a year at the outbreak of World War I, then declined sharply, and rose again greatly during the first 2 decades of the 20th Century. The first significant legislation to restrict ethnic groups was in the early 1880s with the Chinese Exclusion Act; In 1924, Congress passed the 2nd Immigration and Naturalization Act which used the 1890 census to set quotas for ethnic groups, and later used the 1920 census to fix quotas in the national origins system; both pieces of legislation favored Northern and Western Europeans. Immigration declined drastically during the 1930s and early 1940s, but the Displaced Persons Act, the War Brides Act, and 1950s legislation allowed more Asian refugees and some other ethnic groups to enter the country. The nationality origins quotas were eliminated in 1965, and were followed by dramatic changes in immigration character as persons from formerly low quota nations flooded into the US. 1976 and 1978 legislation made immigration still more equitable, and the Refugee Act of 1980 allowed admittance of 50,000 refugees with no regard for geographic or ideological biases. A preference system, in operation since 1924, has favored relatives of citizens and immigrants with certain skills. Females presently outnumber male immigrants, average immigrant age is 26.2 years, and over 1/2 of the immigrants since 1950 have been housewives, children, or others with no occupation. In the 1970s, 1 in 10 immigrants was a professional or technical worker, probably from Asia. In 1900, most immigrants headed for mainly northern, industrialized cities, especially New York. In recent years, too destinations have included New York, California, Washington, Texas, and Florida. Throughout the century, 3/5 immigrants went to only 5 states, so many states have received very few immigrants since 1900. Due to the amount spent on receiving refugees, and economic and job problems, many Americans think immigration should be greatly limited. Today's 1 million legal and illegal immigrants will continue to change the composition of the American population, as the long established Northern and Western European population declines.