ULYSSES, Kan. — Change can be unsettling in a small town. But not long ago in this quiet farming community, with its familiar skyline of grain elevators and church steeples, the owner of a new restaurant decided to acknowledge the community’s diversity by adding some less traditional items to her menu. Cheeseburgers. French fries. Chicken-fried steak.

“American food,” the restaurant owner, Luz Gonzalez, calls it. And she signaled her move by giving her Mexican restaurant a distinctly American name: “The Down-Town Restaurant.”

Such fare was all but extinct in a place where longtime residents joke — often with a barely disguised tone of frustration — that the dining options are Mexican, Mexican or Mexican. After the last white-owned restaurant serving American favorites closed this year, it fell to one of the recent Hispanic arrivals to keep the burgers-and-fries legacy alive. Ms. Gonzalez even enlisted the help of neighbors to teach her to cook more exotic dishes — like potato salad.

For generations, the story of the small rural town of the Great Plains, including the dusty tabletop landscape of western Kansas, has been one of exodus — of businesses closing, classrooms shrinking and, year after year, communities withering as fewer people arrive than leave and as fewer are born than are buried. That flight continues, but another demographic trend has breathed new life into the region.