The US has no requirement to carry your ID. I'm not sure there's any base requirement to have ID.
You only need your driver's license if you're driving, and ID in general is only required for certain activities that directly require identification or use the ID to confirm other information (eg age when buying alcohol).
You only need your driver's license if you're driving, and ID in general is only required for certain activities that directly require identification or use the ID to confirm other information (eg age when buying alcohol).