Originally Posted by soitgoes

It's not a loophole...it's the way it is supposed to work. Citizens of a country should be able to pass their citizenship on to their children. Now, in the past in Germany and elsewhere, only the father could do so. That has changed.

On a side note, the US does have some complicated rules about passing on citizenship from a parent not born in the US to a child not born in the US--there are some US residency requirements that have to be met.