There are lots of copy-paste condo farms here in the Minnesota suburbs. You can easily wander into a neighborhood full of a few hundred physically identical duplexes.

Ugly as sin, but they're cheap housing.

edit: I'll go farther than this. My own house is over 100 years old, in a "bungalow neighborhood" of Minneapolis. Most of the houses were built over a period of a few decades, with more or less the same design. There's a T structure, leading to three sections on the first floor. The entrance is a living/dining area separated by an arch, on the other side of the back wall is the kitchen, and on the other side of the interior side wall is a hallway leading to two bedrooms and a bathroom. They're all like this. And these were built by hand, with the most sophisticated factory parts being two-by-fours and hinges. They might have a porch, or an extension (my house has a back extension built in the 1950s), and the attic might be finished into a single room, or even expanded into multiple rooms with a large dormer. Many/most have been modified over the years. But the basic form? Consistent as a pup tent.

These things are the result of available technology. The bungalows are a product of factory-made nails, which made balloon frame construction viable. In the South, you'll find shotgun shacks, which are what happens when you build a bungalow but don't need or want a basement.

This is nothing new. My neighborhood might look varigaeted, but it's not.