Something that bothers me is the gristly, meager attitude of a certain type of conservation ecology. I think we are really going to start having to cultivate healthy ecosystems from the ground up, regardless of who's originally "from here" or not. I'm very optimistic about permaculture and wild cultivation techniques. I think they deserve more of a shot than people often give them.
And that "ag-tech" oligopoly has gotta go, along with its foolish, ignorant, exploitative approaches to ecology and economics alike.
But the case in point was that the countryside has changed considerably because of changes in agriculture.
The comparison between relatively preserved parks and National Forests (e.g. Willamette) and the rest of the states forests is truly jarring.
For that matter, the same pattern can be seen across the country. Much of Pennsylvania is densely forested, but the entire state has only a few thousand scattered acres of old-growth woods.
Weyerhaeuser, etc. grow those fast growing pulpwood trees and harvest.
I think you mean "before Native Americans arrived". One of the side effects of the European arrival to North America was reforestation due to a disease-driven decline in the population of Native Americans.
European deforestation was most extreme during the late middle ages and early modern period. When people were using wood for fuel in a growing economy, before switching to coal, major European nations were running out of trees. Coppicing was adopted out of a desperate need for basic resources.
This is mostly clearly seen on the east coast because most of the Midwest is still used for farming.
Edit: in Europe this is visible in coppiced forests. https://en.m.wikipedia.org/wiki/Coppicing . Haven't seen one here in the US but I assume they're somewhat common in Europe where they were an early and effective method of sustainable forestry.