The era after the Civil War, known as the Gilded Age, saw the continued rise of industry in Pennsylvania. Pennsylvania was home to some of the largest steel companies in the world, as Andrew Carnegie founded the Carnegie Steel Company and Charles M. Schwab founded the Bethlehem Steel. Other titans of industry, such as John D. Rockefeller and Jay Gould, also operated in the state. In the latter half of the 19th century, the U.S. oil industry was born in western Pennsylvania, which supplied the vast majority of kerosene for years thereafter. As the Pennsylvanian oil rush developed, the oil boom towns, such as Titusville, rose and fell. Coal mining was also a major industry in the state. In 1903, Milton S. Hershey began construction on a chocolate factory in Hershey, Pennsylvania; The Hershey Company would become the largest chocolate manufacturer in North America. The Heinz Company was also founded during this period. These huge companies exercised a large influence on the politics of Pennsylvania; as Henry Demarest Lloyd put it, oil baron John D. Rockefeller "had done everything with the Pennsylvania legislature except refine it". Pennsylvania created a Department of Highways and engaged in a vast program of road-building, while railroads continued to see heavy usage.
