Apparently, some indigenous North Americans lived and grew their food dish way before the European conquests. many of the forests in the eastern part of the United States were apparently cultivated with all kinds of different trees for food, including acorns.

People knew how to detoxify the acorns and grind them into flour that was tasty and fit for human consumption.

When European settlers arrived and saw the vast forests of oak, we believe they were looking at wilderness when in fact what they were looking at were food farms made up mostly of trees.

Jared Diamond and other scholars have written a bit about this, and about how much more North America was populated when Columbus arrived than we think.