Pre-Columbian woodlands of North America

Pre-Columbian woodlands of North America, consisting of a mixed woodland-grassland ecosystem, were maintained by both natural lightning fires and by Native Americans before the significant arrival of Europeans. Although decimated by widespread epidemic disease, Native Americans in the 16th century continued using fire to clear woodlands until European colonists began colonizing the eastern seaboard.

Source: Wikipedia — Pre-Columbian woodlands of North America (CC BY-SA 4.0)