Chapter 5 - Job Portability after Adjustment Filing and Other AC21 ...
...A. Background In 2000, Congress enacted the American Competitiveness in the Twenty-First Century Act of 2000 [1] (AC21) which, in part, added INA 204 (j). This provision allows certain employment-based adjustment of status applicants experiencing delays in the employment-based adjustment of status process some flexibility to change jobs or employers while their Application to Register ......
https://www.uscis.gov/policy-manual/volume-7-part-e-chapter-5