I think you're really overestimating how much most Americans think about Germany. The first result on Google says only 20% of Americans can name all 50 of our own states, and a shockingly large amount of Americans really don't know anything about the world outside of 100 miles of where they were born.

I'm betting we're gonna run into a selection bias issue here, but can you name any Chinese provinces? Or Argentinian ones? I'd guess most Americans think about China more than Germany these days, and couldn't name any Chinese provinces besides the major cities at most, and even then I wouldn't be surprised if they knew none of those. Germany really doesn't come up in conversation any more than Argentina, other than many a few more people coming back from vacation in Germany.

I'm admittedly terrible at European geography, but I'm not exactly ashamed of not being able to name all the countries in Europe, since it's generally not relevant information for me. I'm sure I'll learn more about it when I plan to travel there.