Japan's Nippon expected to close acquisition of U.S. Steel at $55 per share, sources say
1. Nippon Steel plans to acquire U.S. Steel for $55 per share. 2. Trump supports Nippon's bid, promising $14 billion investment. 3. Biden previously blocked the acquisition citing national security risks. 4. New review ordered by Trump could change acquisition dynamics. 5. U.S. Steel's headquarters will remain in Pittsburgh post-acquisition.