Nippon Steel has completed its $14.9 billion takeover of U.S. Steel, the company announced Wednesday, capping a year and a half of fraught negotiations and resulting in a landmark deal for a president who originally opposed the deal. The agreement includes a "golden share" arrangement that gives President Donald Trump final say over key parts of the company's U.S. business -- including plant closures, headquarters location and employee salaries -- as a way to ease earlier national security concerns. Nippon, a Japanese steel giant, also plans to invest an additional $11 billion in its U.S. operations by 2028. Combined, the new company will become the world's second-largest steelmaker, giving it a leg-up in an industry largely dominated by China. "Together, Nippon Steel and U.S. Steel will be a world-leading steelmaker, with best-in-class technologies and manufacturing capabilities," the companies said.