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Butte became an important copper mining town during the late 19th century. The prospect of mining jobs attracted people from many ethnic backgrounds; the town became the fourth largest immigration center in the state. As the population grew it became clear that a federal courthouse and post office was needed to accommodate the the Butte's needs. The building served as a post office for 60 years before moving to another building. Its function as a federal courthouse was instrumental in developing the town's ethnic makeup—many immigrant workers became American citizens. in 2002, the building was renamed after Montana U.S. Senator Mike Mansfield.

Sources

"Building Overview," http://www.gsa.gov/portal/ext/html/site/hb/category/25431/actionParameter/exploreByBuilding/buildingId/295#. Retrieved 5-6-15. Kardoes, Mary J. "U.S. Post Office," http://pdfhost.focus.nps.gov/docs/nrhp/text/79001426.PDF. Retrieved 11-15-79.