HARRISBURG — Nippon Steel and U.S. Steel said Wednesday that they have finalized their “historic partnership,” a year-and-a-half after the Japanese company first proposed its deal to buy the iconic American steelmaker for nearly $15 billion.

Nippon Steel completes its purchase of U.S. Steel after more than a year and half of high-stakes negotiations and national security concerns.

The "golden share" gives the U.S. government a level of control, but not a financial stake, in the Pittsburgh-based company.