The US has so much space
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Now do Alaska, Im willing to bet that you could find a route that will take a week even in the summer
Alaska is hard because there are so many cities/towns that aren't a available with a road. Plenty of communities served by boat/plane only.
There are also ice roads in Alaska. I was going to post my favourite Canadian one, but I can't since it's April. Going from Soutt to North in my province takes 22 hours in the winterm and is impossible in the summer.