Final answer:
Huntington's, Parkersburg, Morgantown, Wheeling, Weirton, Fairmont, Beckley, Martinsburg, and Clarksburg in West Virginia experienced development due to the coal mining industry.
Step-by-step explanation:
Huntington's, Parkersburg, Morgantown, Wheeling, Weirton, Fairmont, Beckley, Martinsburg, and Clarksburg are all cities in West Virginia that experienced development due to the coal mining industry. During the first two-thirds of the 20th century, coal mining was a major source of employment in these areas. However, with increased mechanization and the use of new mining techniques, the number of miners needed decreased, even as coal production increased.