There are no plantations around here. This was cattle and grain country in that time. Farmers got rich because all of sudden their manual labour capacity was multiplied by machines. The story is quite similar to those who used software to multiply their output in our time, and similarly many tech fortunes have built mansions just the same.
> Not shacks, but nothing gigantic or luxurious.
Well, they weren't palaces. You're absolutely right that they don't look like mansions by today's standards, but they were considered as such at the time. Many were coming from tiny, one room log cabins (stuffed to the brim with their eight children). They were gigantic, luxurious upgrades at the time. But progress marches forward, as always.
I think you are using the word "farmer" to mean "large agricultural landlord". Today, those terms may have a lot of overlap, but in the past, it wasn't so much the case.
Feudalism in North America, in the 1900s? Your geography and timelines are way off.
Those are far closer to medieval feudal peasantry than 20th century industrial labor, regardless of the lack of an official hereditary aristocracy in the US.
> There are no plantations around here.
FWIW you haven't really stated where "here" is for you. It's not necessarily going to be the same for everyone, and based on the parent comments, the potential area under discussion could include the entirety of the US and Europe (although the initial comment only mentioned UK specifically, it doesn't seem clear to me that it's explicitly only talking about that). I'm not sure you can categorically state that no one in this conversation could be talking about areas that have plantations.
Those are usually large plantations, and the people who owned them weren't just farmers but vast landholders with very low paid labor working the farm (at one time usually enslaved). I doubt they were representative of the typical turn of the 20th century farm.
If we're speaking from vibes rather than statistics, I'd argue most 19th century farmhouses I've seen are pretty modest. Not shacks, but nothing gigantic or luxurious.