USCIS and the Department of State publish the rules Visa Engine maps for US routes. Talent petitions (O-1A, O-1B, EB-1A, EB-2 NIW) are scored against 8 CFR criteria and Policy Manual guidance. Visitor cases (B-1/B-2) are prepared against INA § 214(b) — ties, purpose, and temporary intent. Every US guide follows the same walk: visa, criterion, evidence, cited source.