Re: OK, I'll bite
Sunny California uses the driver's licence (-se?) as official ID. Those who don't drive can get an equivalent official ID from DMV if they want to. Quite a few places ask to see it, often if you're making a large purchase with a credit card, but it's not the intrusive thing that would have been the UK ID card. You hand over your credit card (or swipe it yourself, or occasionally put it in the chip-reader slot) so they already know who you are, then they ask to see ID, so you show then your licence, which looks official and the photo looks vaguely like you, and that's it. No logging into a surveillance database that you bought such and such an item at a store, it's very low key and there seems to be no push to make it worse.
Now, if the UK had started along those lines they could probably be introducing their huge database around now.