When you say "Germany", you either refer to Germany right now, or to Germany between its creation and now or in the future. I fail to see the difference between that and referring to a particular.
If you're referring to a particular idea of Germany in your head, then a claim that you were wrong about "Germany" would be nonsensical. It's the idea in your head, and is right by definition.
If the idea of "Germany" in my head includes the idea that Mozart was born there, then am I right about "Germany" or wrong? If the idea in my head includes that concept, does that mean my idea of "Germany" is right (I'm referring to the particular idea of "Germany" in my head) or am I actually referring to a shared concept "Germany" that I can actually be factually incorrect about, and hold wrong ideas about?
If the idea in my head about "Germany" can be wrong, then "Germany" can't refer to the idea in my head.
"Germany" is a social construct. It is an agreement between humans. Each human has its own concept of "germany" that is synchronized by various sorts of interactions. Thus "germany" is in my head and that can be "wrong" if it is enough dissimilar to the "germany" in other peoples heads.