SEOUL, South Korea (AP) — The United States has agreed to allow South Korean workers on short-term visas or a visa waiver program to help build industrial sites in America, Seoul’s Foreign Ministry said Wednesday. The announcement came weeks after South Korea flew home more than 300 of its nationals who had been detained in a massive immigration raid at a battery factory being built on Hyundai’s sprawling auto plant campus near Savannah, Georgia. South Korea has called for more fundamental steps, such as creating a new visa category to expand access for skilled workers. But U.S. officials at the Washington meeting said major changes would be difficult because of legislative constraints, according to a statement from the South Korean ministry. Most of the Korean workers detained in Georgia were employed by LG Energy Solution and its subcontractors and held ESTAs as well as other visas.