1. Like Twi said, it's expensive to transport heavy building materials 2,000+ miles. Plus, the sorts of building materials that hold up well against tornadoes are completely terrible for earthquakes. We have several earthquake zones in the States, and there's some overlap with tornado territory. Really, the U.S. is a huge overlapping Venn diagram of potential natural disasters. And none of it matters, 'cos someday the Yellowstone supervolcano will erupt and kill us all.
2. Heh, yeah. Street layouts here are usually well-planned, but we have exceptions. Kansas City is nice and gridded - except where it isn't. Sometimes I think it's a bit worse to be expecting logical layouts and suddenly find that the street you expected to go through suddenly dead-ends in a housing division because cul de sac.
3. With a few exceptions, it's actually very difficult to impossible to manage in the U.S. without a vehicle. Our public transit is awful, sometimes nonexistent. I know I've said this before, but the KC metropolitan area crosses two states and four (maybe six, depending on who you ask) counties. Each of these regions has their own bus system, and NONE of them intersect. You want to hop a bus across the state line? Good luck, 'cause you're going to have get out and walk between stops, sometimes several miles, just to cross over between the bus systems. My husband used to have a job up in the northland, and we live on the south side of the city. He once calculated the bus route he'd have to take to get from our house to work, and it came up to a nine hour commute. And that was with both origin and destination in the same state!
4. Americans are obsessed with lawns. Lawns are stupid but impossible to escape in the Midwest.