Thank you, Martin.
Don't worry about your "faults" as you put it. Your English is very good and will improve with even more usage. I speak neither German nor French but as I live in California and Spanish is prevalent here, that's what I focus on as a second language.
I know where Luxembourg is; when I was little, I remember reading a story about a little girl living in Luxembourg while under the German occupation and the problems she was faced with. Quite a difference in the way she grew up vs mine here in the U.S.
For one so smitten with the idea of the U.S., you should think about coming over for a visit. I doubt you will be happy till you see it for yourself. We Americans tend to take it for granted but everyone I've ever known from Europe or elsewhere are really quite amazed. Our country is as vast as it is beautiful.
Marilyn