| 1790 | The federal government requires two years of residency for naturalization |
| 1864 | Congress legalizes the importation of contract laborers |
| 1819 | Congress establishes reporting on immigration |
| 1885 | Congress bans the admission of contract laborers. |
| 1929 | Congress makes annual immigration quotas permanent. |
| 1952 | Immigration and Nationality Act: individuals of all races eligible for naturalization; reaffirms national origins quota system, limits immigration from Eastern Hemisphere; establishes preferences for skilled workers and relatives of U.S. citizens and permanent resident aliens; and tightens security and screening standards and procedures | |
| 1953 | Congress amends 1948 refugee policy to allow for the admission of 200,000 more refugees | |
| 1980 | The Refugee Act redefines criteria and procedures for admitting refugees |
| 1986 | Immigration Reform and Control Act (IRCA) legalizes illegal aliens residing in the US unlawfully since 1982. |
| 1849 | The California Gold Rush sparks the first mass immigration from China. |
| 1943 | Magnuson Act of 1943 repeals Chinese Exclusion Act of 1882, establishes quotas for Chinese immigrants; makes them eligible for US citizenship. |
| 1965 | Immigration Act of 1965 establishes quota systems with 20,000 per country limit; gives preference to immediate families of immigrants and to skilled workers. |
| 1876 | California Senate committee investigates the social, moral, and political effect of Chinese immigration. | |
| 1877 | Congress investigates the criminal influence of Chinese immigrants. | |
| 1882 | Chinese Exclusion Act of 1882 suspends immigration of Chinese laborers under penalty of imprisonment and deportation. |
| 1945 | War Bride Act and G.I. Fiancées Act allow immigration of foreign-born wives, fiancé(e)s, husbands, and children of US armed forces personnel. | |
| 1948 | The United States admits persons fleeing persecution in their native lands; allowing 205,000 refugees to enter within two years | |