Add west germany to the answer with Germany? Although today we know, it was impossible to predict that the BRD would be the german unifiers then, and it could not represent the whole of Germany until 1990 although the government is continuous. Kind of like how we don't call either country Korea.
That's very different. Everyone always knew it as USA, they just added to the territory of the country by annexing states. West Germany and East Germany were separate recognized entities