The Industrial revolution.
Pioneers got replaced by rails
Explorers ran out of places to explore
Cowboys got replaced by barb wire and, later industrial high density feedlots
Indian fighters were a bunch of rapists and thieves who put them self out of business by crushing the last of the Indians
War heroes were doomed by the a-bomb and the drone, as well as the realization of their own flawed humanity
They are now all symbols, painted on a cave wall, worshiped but never understood by sun-fearing cult.
Now that we're out of things to steal, our success is absolute, we've traded our balls for ball bearings, the machines have beat us at our own game, Deep Blue beat Kasparov then took a shXt on John Henry's grave.
In this environment only the machine and the souless liberal bugman can survive. All others are dodos and dinosaurs and polio crutches.