The U.S. Steel-Nippon Steel deal includes several provisions giving the U.S. government power over several key issues. With the completion of this deal, it begs the question of how unique it is for the government to be involved in private business.

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

Nippon Steel's $14.9-billion acquisition of U.S. Steel closed on Wednesday, the companies said, confirming an unusual degree of power for President Donald Trump after the Japanese company's 18-month struggle to close the purchase.