Coatesville developed in the early 20th century with the growth of the Lukens Steel Company and other industry. Its population declined after industrial restructuring, which reduced these jobs. Lukens was bought by the Bethlehem Steel Corporation in 1997. In 2002, Bethlehem was bought by the then Ohio-based International Steel Group (ISG). Mittal Steel Company acquired ISG and merged with Arcelor to form ArcelorMittal. In 2020, Cleveland-Cliffs acquired the United States operations of ArcelorMittal.
Coatesville developed in the early 20th century with the growth of the Lukens Steel Company and other industry. Its population declined after industrial restructuring, which reduced these jobs. Lukens was bought by the Bethlehem Steel Corporation in 1997. In 2002, Bethlehem was bought by the then Ohio-based International Steel Group (ISG). Mittal Steel Company acquired ISG and merged with Arcelor to form ArcelorMittal. In 2020 Cleveland-Cliffs acquired the United States operations of ArcelorMittal.