U.S. immigration agents detained 475 workers, including 316 South Koreans, at a Hyundai-LG battery site near Savannah, Georgia, stirring diplomatic friction. After talks between Seoul and Washington—and a push from President Trump to keep some technicians in the U.S.—330 detainees were released and flew to Seoul. The case spotlights the collision of immigration rules, industrial policy, and a key alliance.