I had not heard of the Canadian usage of "First Nation" as a descriptive term.

I do recall that a few years ago my very good friend, shaman John Joseph, was somewhat bemused when he showed me a visa he acquired for an extended stay in Canada, on which they had stamped "Native American Savage" as the official descriptor.

I suppose that's changed. I don't think I'd recommend it as a "currently PC" term.

John