Question: William S. Dietrich II took over and expanded a business located in what state?

The Pioneer Oil Company Filling Station is a historic building located in Grinnell, Iowa, United States.  The northern half of the building dates back to the 1920s when it was associated with a local farmers' cooperative.  One of the services they provided was selling gasoline.  The building was expanded in 1931 into a more traditional filling station as selling fuel became a more prominent part of the operation.  The building attained its present appearance in 1937 when the service bays and the decorative brick veneer were added.  It retained its original name, "Pioneer Oil Company," throughout its time as a service station even though it became affiliated with Mobilgas in 1936.  That affiliation ended in 1962.  During World War II it became a tire inspection center under the wartime tire rationing program.  The service station ceased operations around 2004.  The building was re-purposed into the Mobil Wash and Wax, an automotive detailing business located in the service bays, and the Candyland Cafe in the northern portion of the building.  It was listed on the National Register of Historic Places in 2013. <SEP> Rosecroft Raceway, nicknamed the "Raceway by the Beltway" for being close to Interstate 495, is a harness racing track in Fort Washington, Maryland.  It first opened in 1949 and was owned by William E. Miller, a horse trainer and breeder.  Rosecroft quickly became Prince George's County's political and social center, drawing thousands of people there each racing day.  In the early 1950s, average attendance was more than 7,000 per day.  After Miller died in 1954, his son John owned Rosecroft until his death in 1969.  Rosecroft hosted memorial stake races annually for both William and John until 1995.  Following the death of John Miller, Earle Brown controlled operations until he moved to a different position in 1980; William E. Miller II took over following Brown. <SEP> William S. Dietrich II (May 13, 1938 – October 6, 2011) was a successful industrialist who took over and expanded Dietrich Industries, a steel framing manufacturer which he eventually sold to Worthington Industries.  Late in life, he made two of the largest charitable contributions in higher education history, to the University of Pittsburgh and Carnegie Mellon University. <SEP>  The Columbus, Ohio based company is a steel processor and manufacturer of pressure cylinder, such as propane, oxygen and helium tanks, hand torches, refrigerant and industrial cylinders, camping cylinders, exploration, recovery and production products for global energy markets; scuba tanks, and compressed natural gas storage cylinders; custom-engineered open and enclosed cabs and operator stations for heavy mobile equipment; framing systems for mid-rise buildings; steel pallets and racks for shipping. Worthington Industries is a global diversified metals manufacturing company with 2015 fiscal year sales of $3.38 billion.  In addition to its three primary business units (steel processing, pressure cylinders and engineered cabs), the company’s approximately 10 joint ventures also focus on metals-related markets.