Nippon Steel Corp. has announced an additional $1.3 billion investment in U.S. Steel plants, specifically targeting the Mon Valley Works in Pennsylvania and the Gary Works in Indiana, contingent on the completion of its $15 billion acquisition of U.S. Steel. The investment aims to upgrade facilities to improve productivity, energy efficiency, and product quality, thus extending the operational life of these plants. Despite these commitments, the acquisition faces significant opposition from the United Steelworkers union and political figures, including President Joe Biden, due to concerns over national security, labor conditions, and maintaining U.S. ownership. The union supports a competing bid from Cleveland Cliffs and has criticized Nippon for not addressing contractual obligations to retirees and local communities. The acquisition is expected to close in the latter half of 2024, pending regulatory approval and resolution of these disputes.