We are never going to fully appreciate the extent of rainforest societies. We will get better at guessing, but we will always underestimate them unless we give them the benefit of the doubt.
I mean, you’re fighting entropy every day. Sounds like an eco paradise but is also hell for historians.
Modern day people claim the settlers built them all. This is simply impossible. The walls of New England are ruins.
Whether or not it's true, it's not at all impossible that the settlers built them all. Almost all of New England was deforested during the 1600s - 1800s. It has since reforested since the land was marginal to start with and was outcompeted by midwestern farms.
There were several hundred years for farmers to build stone walls out of annoying rocks; it doesn't have to be a mystery.
with railroads to move the produce.. yes.
It was not fun to be a New England farmer after the end of the Civil War, economically. Things got difficult.