Well, I'm not a PC person and I've known them as Native Americans all my life, and to call them by any other name just sounds weird to me.
American Indians is fine by me also. I know a lot of Canadian Indians but even they call themselves Native Americans up here. Our local tribes have a lot of dual-citizens in their ranks where we live so close to the border.
To be honest I wasn't even aware it was called American Indians until it was just mentioned. When I post topics there I'm thinking Native American section so I guess that shows how much I pay attention.
Maybe I have a mental block or something but they are NA to me. When I discuss them I refer to them as NA. I guess you can't always teach an old dog new tricks.

To argue with a person who has renounced the use of reason is like administering medicine to the dead.
Thomas Paine
It's impossible to be an effective leader of a country when everyone thinks you are stupid.