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NAT is no security feature. You can't just turn it on or off as you like, you either require it or can't use it at all depending on your setup.
NAT for IPv6 doesn't exist, so no, not a single IPv6 router in the US (or elsewhere) has NAT enabled (or an option to turn it on).
If you find some NAT settings in your router configuration these are IPv4 settings.
If your ISP supports IPv6, then all your local network computers are accessible directly by IPv6, no matter what settings you choose for IPv4 connections.
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