1491 covers "Indian fire" quite a bit. Seems that much of North America was under some form of active management by native peoples before Europeans arrived, and one of the main ways, and probably the main way, by area, was very frequent fire-setting. The book even suggests that might be why there is a "Great Plains", in the nearly-treeless form European settlers found it, while in the East early European accounts tell of huge forest "wildernesses" so universally free of undergrowth one could easily ride a horse through them, which would become impassably full of low growth by a couple hundred years later as the burning stopped.