Most non-isekai anime have some ties to the real world, either they are fictionalized versions of real history or they are simply placed within a context that is entirely relatable. Spy x Family is no exception, and its ties to the real world are arguably more clear and more prevalent than even the average show. The cold war and the berlin wall were real dividing factors in Europe in the mid-1900s and the thinly veiled names for various aspects of this society demonstrate that that conflict is exactly what the creators were hoping to evoke. By referring to a real-world event the creators don’t have to work as hard in world-building and can instead focus that airtime on developing the characters and storylines more fully.