Butte

Established in 1864 as a mining camp in the northern Rocky Mountains on the Continental Divide, Butte experienced rapid development in the late 19th century, and was Montana's first major industrial city. In its heyday between the late 19th and early 20th centuries, it was one of the largest copper boom towns in the American West. Employment opportunities in the mines attracted surges of European and Asian immigrants, particularly the Irish; as of 2017, Butte has the largest population of Irish Americans per capita of any U.S. city.

Butte was also the site of various historical events involving its mining industry and active labor unions and socialist politics, the most famous of which was the labor riot of 1914. Despite the dominance of the Anaconda Copper Mining Company, Butte was never a company town. Other major events in the city's history include the 1917 Speculator Mine disaster, the largest hard rock mining disaster in world history.