Reddit mentions of Agrarian Socialism in America: Marx, Jefferson, and Jesus in the Oklahoma Countryside, 1904–1920

One of the interesting things this book gets at early on about why socialism took off so well in frontier Oklahoma, was at its base level an understanding that the place was so difficult to settle (Harsh weather, unpredictable rain patterns compared to the east coast, etc.) that unless everyone grasps the importance of working together, everyone is going to die.

Of course that is viewed through the lens of native peoples already being there.

They did, actually. The New Deal would have been DOA were it not for rural support. FDR knew that and that's why he pushed for rural electrification and made rural jobs a central part of the WPA.

There's been several books written about the Socialist Party itself in rural America. Here and here are two examples.

The rural south is where politicians like Huey Long got along. They loved Long out in the rural areas of Louisiana, but fucking hated him in Baton Rouge.

Now, that was a long fucking time ago, but even as "recent" as the 70s, union Democrats were there, hooking up with progressives on a variety of environmental issues. (Which you can see in the Harlan County, USA documentary.) It tapered off in the 80s, but the last big rush of progressive/rural alliances was when Judi Bari was around and helped the loggers and environmentalists in California connect in the 90s.

Read this book: https://www.amazon.com/Agrarian-Socialism-America-Jefferson-Countryside/dp/0806134275