I'm not asking for a literary analysis, I just don't understand the basic literal meaning of one line in this poem (Mnemosyne, by Trumbull Stickney):
It’s autumn in the country I remember.
How warm a wind blew here about the ways!
And shadows on the hillside lay to slumber
During the long sun-sweetened summer-days.
It’s cold abroad the country I remember.
The swallows veering skimmed the golden grain
At midday with a wing aslant and limber;
And yellow cattle browsed upon the plain.
It’s empty down the country I remember.
I had a sister lovely in my sight:
Her hair was dark, her eyes were very sombre;
We sang together in the woods at night.
It’s lonely in the country I remember.
The babble of our children fills my ears,
And on our hearth I stare the perished ember
To flames that show all starry thro’ my tears.
It’s dark about the country I remember.
There are the mountains where I lived. The path
Is slushed with cattle-tracks and fallen timber,
The stumps are twisted by the tempests’ wrath.
But that I knew these places are my own,
I’d ask how came such wretchedness to cumber
The earth, and I to people it alone.
It rains across the country I remember.
"But that [I knew (that) these places are my own]" - this doesn't seem to make sense, and fails to dovetail with the rest of the sentence.
Does he mean "If I hadn't known that these places are my own, I would've asked how came such wretchedness to cumber the earth, and I to people it alone"?
Meaning, "these places are so wretched that if I did not already know that they are in fact the places where I spent many years, I would've asked how come they are so wretched".