"As a brit, I was shocked at how few roads actually have pavements (sidewalks?) outside of city centres in Leftpondia."
Having lived in Cornwall (Bude/Stratton/Poughill) & Yorkshire (Harrogate/Knaresborough & environs) & the wilds of Scotland (Applecross), methinks your knickers are showing.
"Hell, I was also shocked about how many properties along these roads without pavements had walls and fences that stretched right to the road."
Suggestion: Get out more. Inspect the hedgerows. Learn a little about the environment you are living in (and trying to comment on). Have a pint along the way. It'll do you a world of good.
"Walking half a mile in a suburban area to get to a local shop got you odd looks, like you were proposing to set out to walk to the moon in only a thong."
Really? Where I live (Sonoma, CA), it's quite encouraged socially ...
"It seems to be quite a people-hostile place in suburban America."
That's a whole 'nuther kettle of fish ... People (as a species) didn't evolve to live on top of each other like hamsters ... must dash, the farrier is here.