Here are some reasons why this is likely:
* Geographic Location: Hannibal, Missouri, and Denver, Colorado, were both located in the Midwest during her lifetime. Accents are heavily influenced by the regions where people grow up.
* Timeline: Molly Brown was born in 1867 and died in 1932. The Midwestern accent was well-established during this period.
* Historical Evidence: While there are no recordings of Molly Brown's voice, anecdotal accounts from people who knew her suggest a Midwestern twang.
It's worth noting that accents can evolve over time and individuals may speak with a variety of dialects depending on the social situation. While a Midwestern accent is the most likely, Molly Brown may have adopted other speech patterns during her travels or when interacting with people from different regions.