Yes, in the Wilamette Valley the indigenous folks maintained Gary Oaks and prevented other trees from growing there. This was open oak savannah, and when the settlers came in they took the land and turned it to agricultural land. What they couldn't plant on, they ignored, and other tree species moved in to land that was previously managed to grow Gary oaks.

I'm a PNW native, you don't need to tell me about the small sliver of old growth we still have in the Olympics.