Subject: Re: Supreme Court Today
If the US can exercise a claim like that [having to register for the draft] on spawn born of US citizens, in other countries, then some other countries could conceivably exercise a claim on spawn born in the US, from citizens of that other country.

I say what of it? The child so born ends up with dual citizenship. When in either country's soil, they are "under the jurisdiction thereof". Is there a problem with that? Whatever issues currently exist with people holding dual citizenship would simply apply to those newly born into it.