Short answers, pulled from the story.
U.S. Steel was founded in 1901 when J.P. Morgan orchestrated a merger of Carnegie Steel, Federal Steel, and National Steel for $492 million. Andrew Carnegie served as the primary financial backer through gold bonds while Charles M. Schwab became the first president.
The Amalgamated Association of Iron and Steel Workers union was broken after a violent strike at the Homestead Pennsylvania plant in 1892. U.S. Steel defeated another strike in 1901 which was the very year the company was founded.
U.S. Steel had agreements with over 20 Alabama counties to use convict labor paying locals nine dollars a month per worker from the late 1920s. Many prisoners were forced into mines under harsh conditions where some died from abuse and malnutrition.
President Joe Biden declared that U.S. Steel must remain American-owned stating the acquisition posed a risk to national security on the 3rd of January 2025. The Committee on Foreign Investment in the United States concluded its review without reaching consensus on national security risks before the block.
Gary Works in Indiana remains the largest integrated mill in North America having been built in 1906. Clairton Coke Works serves as the largest coking facility in North America while other facilities exist in Slovakia and Serbia.