Heber City, Utah — Pop culture has gone country. Beyoncé broke stadium attendance records this year with her country-couture Cowboy Carter tour. “Yellowstone” has spun off its own cinematic universe.

The horses charged out of the stables, kicking up a cloud of dirt. Sitting atop, cowboys donning blue jeans and cowboy hats waved flags that read “God Bless the USA,” as the crowd roared. No, this is ...