Getting back to the house, of course, meant walking back to the house. That was a couple of miles- Liz more readily thought of it as three kilometers-and took more than half an hour. Going from one place to another here was like traveling in the home timeline in one way. Ten minutes of travel was a short trip, half an hour was kind of medium, an hour was long, and two hours was a pain in the neck reserved for something that had better be special.

But how far you went in your time shrank drastically. Here you traveled on foot, or maybe on horseback. If you were very rich, you might have a carriage. Some bicycles survived, but their rubber tires didn't. With wooden tires, riding them was a good way to shake your kidneys loose.

And so you mostly didn't go more than four or five miles- six or eight kilometers-from where you lived. As they had in the days before trains and cars and planes, people lived their whole lives within twenty or thirty miles of where they were born. If this alternate didn't regain its technology, lots of little, very different peoples would sprout from the ruined tree trunk of the USA.

That was already starting to happen. The Westside and the Valley weren't just independent countries. People in both of them spoke English, but it wasn't quite the same English. People from the Valley had a nasal accent that made it pretty easy to pick them out from Westsiders by ear. In another few hundred years, the two dialects might turn into separate languages. Even if they didn't, it was pretty clear that people from Southern California would have trouble understanding people from the upper Midwest. And both those groups would have trouble with the language they spoke in the deep South.

Liz looked around to make sure no locals could overhear. When she saw they couldn't, she asked, “Is what I'm getting out of the library helping you figure out just where this alternate split off from the home timeline?”