Certain illegal aliens who were eligible to apply for temporary resident status under the legalization provision of the Immigration Reform and Control Act of 1986. To be eligible, aliens must have continuously resided in the United States in an unlawful status since January 1, 1982, not be excludable, and have entered the United States either 1) illegally before January 1, 1982, or 2) as temporary visitors before January 1, 1982, with their authorized stay expiring before that date or with the Government’s knowledge of their unlawful status before that date. Legalization consists of two stages--temporary and then permanent residency. In order to adjust to permanent status aliens must have had continuous residence in the United States, be admissible as an immigrant, and demonstrate at least a minimal understanding and knowledge of the English language and U.S. history and government.
Source: U.S. Citizenship and Immigration Services