I was born in the US but I live in Canada. I am confused about the "US Person" part of the tax information. By the terms of the tax interview I am a "US Person" by birth, but I don't do anything in the US, I don;t really go to the US, I only pay taxes in Canada and I don't really even identify as an American. If I answer that I am a "US Person" then am I going to be stuck filing income from two different countries? It's not clear to me. Does anyone have any experience with this?
If you have renounced your US citizenship, or had it revoked, you are not a "US person". That's a term used in desperation because our tax code is so botched. It includes anybody resident in the US, and any US citizen living anywhere in the world.
Note that for a few years it included Boris Johnson, former mayor of London and now MP, whose mother happened to be in New York when he came along. He was unaware of (or perhaps only amused by) this fact until he sold a house and got a tax bill from the Internal Revenue Service.
I think you can simply identify as Canadian on the tax interview. It doesn't really ask about your birthplace, does it? (There wasn't any interview when I began publishing, and I have never filled one out.) Unless you're a high earner, it probably doesn't make any difference, but you really don't want to get your CA income entangled with this (probably trivial) US income.
(Don't trust KDP to publish a print edition. Don't trust CreateSpace to publish an ebook.)