The American Competitiveness in the 21st Century Act (AC21) was an act passed by the government of the United States in October 2000, pertaining to immigration to the United States.[1][2] It was a complement to the American Competitiveness and Workforce Improvement Act that had been passed in 1998. The focus of AC21 was to change rules related to portability and caps for the H-1B visa to increase the effective number of visas available and make it easier for workers on those visas to switch jobs. Although the language of the Act references the Immigration and Naturalization Service (INS), the INS would soon be restructured and the functions of the INS referenced in AC21 would be handled by United States Citizenship and Immigration Services.
uscis-guidance-june-2001 was invoked but never defined (see the help page).