Markings along the Mother Road

Those of a certain generation know what we’re talking about—the ubiquitous doodle from World War II that helped build a sense of American moxie, resilience and camaraderie. It appeared everywhere from bathroom walls to liberated buildings, in the textbooks of high school pranksters, on vehicles and tanks.

It wasn’t, by a long shot, the first-ever example of graffiti. The word likely sprang from the…