Problem with German cities is that there are so many with about equal importance, but none of them are really "up there" on a international scale.
If Hamburg should be added, why not Cologne, Munich, Dusseldorf, Stuttgart?
Same with US cities.
Well I think it's safe to at least add Hamburg and Frankfurt for Germany and Houston and Miami for the US. But we also must not put to many cities for one country on the list and leave room for some Chinese cities that didn't got mentioned yet. (Why Guangzhou, but not Tianjin, Shenyang, Wuhan, Chonqing, Shenzen - I guess we need a Chinese forumer for this one).
“A developed country is not a place where the poor have cars. It’s where the rich use public transport”
– Gustavo Petro, Mayor of Bogotá, Colombia