Absolutely it could work in the US, but I think we're going to need to see it used at the lower end of the value spectrum first on a regular basis. I'm accumulating within a lightning wallet so I can refill my zap bucket when I need to before Monday when I really hope we'll see a lot of people sharing photos of the eclipse on Nostr that we can enjoy and pay for. Paying for entertainment with zaps in the US is very different from paying for food in the Kakuma refugee camp, but both can be done on the same network.