I am sorry you took my response as rude. I am aware that there can easily be a cultural misunderstanding between Germans and US-Americans where the German directness comes off as rude to a US-American. If I had wanted to be rude I would not have used "please", offered suggestions on how to provide better questions in the future, and maybe not even provided an explanation to the actual matter until additional information was provided.
As with there not being a "USA group", the default, global space (in English) is supposed to include all English-speaking users regardless of location. Only select, other languages have their own space for people to post in their native languages. The German space only exists for historic reasons - there used to be quite an active German community in the old forums, but now it has mostly died out and I am hoping we can put the German space to rest after migration to the "next new platform". A "USA group" would likely be just as quiet / "dead" as the German space, since most of the active Alfresco community are European, Indian/Asian or non-US-Americans.