On any given day, a visitor to the Crystal Bridges Museum of American Art in Bentonville, Arkansas, could encounter something uncommon. Alice Walton, daughter of Walmart founder Sam Walton and the current richest woman on Earth, is known to stroll the galleries of the world-class art museum she built in a ravine in the Ozark Mountains. Since its 2011 opening, the admission-free Crystal Bridges has turned Walmart’s modest hometown into a global arts destination, and kicked off a remarkable 15-year spree of cultural and civic development. It’s impossible to miss the scope of transformation that’s happened in Bentonville, population 63,000. From the downtown square alone, one can see two high-end hotels, a pedestrianized street lined with public art, a large public park under construction, a stretch of the 40-mile Razorback Greenway bike trail, and a modern office building designed so that people can ride their bikes up a winding ramp to a sixth-floor overlook.…