I call them US citizens.

Why not England’s English?

US residents are not Americans. They can identify all they want but it doesn’t make it true.

I might relate to Americans on many things but unless I move there and become a citizen I’ll never be American.

I don’t disagree with your second sentence though. Considering that some US citizens inherited their citizenship from their parents but never lived there for prolonged periods of time. For them, being a US citizen is just a technicality.