Cheyenne, the capital of Wyoming, began as a railroad town and, during the height of the colorful cattle days, became the wealthiest city in the world. Cheyenne has retained its Western frontier traditions while keeping pace with the twenty-first century. The seat of Laramie County, Cheyenne continues to be a railroad and livestock center; the city is also a primary industrial area in the state as well as the site of a major military base. Cheyenne is known for its quality of life and for high clean air ratings.