The area this article is talking about was oak savannah:
Within these oak savannas, which were interlaced with prairies, tree crowns covered between 10 percent and 30 percent of the ground. They were essentially a transition between the tight deciduous forests of the East and the fully open grasslands further west.
Bruh how? You can get kilograms of dried beans for $10.
It’s more expensive for canned beans but for $10 are you eating 5 cans of organic beans a day?