Many US sawmills were shut down over the years because of cheaper foreign govt. subsidized competition and various restrictions on
logging in USA.
It's been going on for a long time.
There is lot more to this story - it also had a detrimental effect on pulp & paper mills in the Pacific Northwest because they were using residual wood-chips & sawdust from those sawmills for raw material.
I worked all my life in the paper industry as a supplier of equipment and saw this happen first hand.
Sad.
No politics please.