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You’re saying that it doesn’t matter because the US government is able to prove his citizenship, but that isn’t in question. The crux of this matter would be whether OP was ignorant of his citizenship and if that ignorance would have any relevance to his case.
Securing official documents only available to American citizens makes it more difficult to argue that he was ignorant of his status as an American citizen. He likely could still make a compelling argument (provided he acts quickly), but it does make it a bit more difficult.
“Jones” is an American slang word meaning to be addicted to something, so “jonesing” for something means to crave something very strongly, and generally very vocally.
“Breve” is a coffee drink that is commonly made with half-and-half, which is a product that is equal parts cream and milk. I assume that people have taken to using the term to refer to half-and-half itself, but I’ve not personally heard that.
So the sentence is saying that their cat was addicted to half-and-half and would act like a junkie doing anything to get their next fix.