The ASSIMILATION Act makes sweeping changes to U.S. immigration policy across multiple areas. It establishes a "national interest standard" requiring that immigrants demonstrate objective benefits to the United States through economic, scientific, educational, security, or health contributions, while eliminating the diversity visa lottery program that previously provided 50,000 annual visas. The bill restructures employment-based immigration by capping visas at 140,000 per year and prioritizing applicants based on salary level, shortage occupations, federal agency certification, or extraordinary ability, while tightening "public charge" rules to presume immigrants are inadmissible if they receive means-tested benefits for more than 12 months within three years. The legislation also restricts temporary parole authority to 90-day humanitarian cases, modifies birthright citizenship rules to require at least one parent be a U.S. citizen or lawful permanent resident, mandates E-Verify employment verification for all employers, and allows family detention during immigration proceedings by removing prior restrictions on detaining children. These changes collectively represent a significant restriction on immigration access and an expansion of enforcement measures.