Nippon Steel is making significant moves to strengthen its foothold in the U.S. steel market, pledging a total investment of $14 billion, which includes $4 billion specifically allocated for constructing a new steel mill. This decision is part of a revised and boosted investment offer as Nippon Steel aims to secure a deal with U.S. Steel. The investment plan has garnered positive reactions in the stock market, with U.S. Steel shares rising on expectations of a favorable outcome for the deal, especially as discussions hinge on potential approval from government officials, including Trump.