@AdeptVeritatis @young_ullrich Makes sense, thanks! I said it sounds like a mistranslation because I was reminded of some misconceptions about Bundesland vs. US state. So I prefer “land”, but it's easy to confirm that you're right and I need to be more careful with the terminology.

Btw. Switzerland has Kantonsverfassungen and Austria has Landesverfassungungen and there doesn't seem to be a conflict. I don't see why the Grundgesetz wouldn't or couldn't be a constitution: bmi.bund.de/EN/topics/constitu