Sentence:  "You're history", we say .... Surely it is an American <WSD>idiom</WSD>. Impossible to imagine a postwar European saying, “You're history. . . . That's history,” meaning fuhgeddaboudit, pal. 
Meaning of the word marked with <WSD> tags:  An established expression whose meaning is not deducible from the literal meanings of its component words, often peculiar to a given language.