I think it's actually called the Gem State. But potatoes are more delicious, so I'm gonna go with that.
I don't really know what the legal requirements are that make a person a resident of any given state - but I'm basing our Idaho residency on the facts that we live here, I have an Idaho driver's license, and we registered both of our cars in Idaho yesterday.
Here's the proof:
Go ahead. Be jealous of our awesomeness.