Born in 1839, William A. Clark Sr., made his fortune in copper mining as well as other ventures and became known as one of the three "Copper Kings" of Butte, Montana. Clark's political aspirations led him to bribing his way into the U.S. Senate. His net worth at the time of his death was nearly equal to that of John D. Rockefeller. Clark County, Nevada (Las Vegas area) was named in honor of Clark's railroad development activities. MSUB's Dr. Keith Edgerton, Professor of History, writes about Clark here: https://mtprof.msun.edu/Spr2014/edger.html.
"A Copper King's Mysterious Marriage: The Peculiar Pairing of William A. Clark and Anna LaChapelle" by Keith Edgerton (sign in with your NetID & Password to view)
Born in Butte, Montana, Robert Craig Knievel (aka Evel Knievel) was a professional stunt performer and entertainer famous for his daredevil motorcycle jumps.
Photo Credit: By Luke Rauscher - Evel Knievel figure at Madame Tussauds Las Vegas, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=79191072