[tango24]

That's one region, not the multiple region that OP mentioned

[AaronFriel]

Services in other regions depended transitively on us-east-1, so it was a multiple region outage.

[sterwill]

Which services in other regions? I remember that day well, but I had my eyes on us-east-1 so I don't remember what else (other than status reporting) was affected elsewhere.