Jus Soli: The law of place, meaning the child was born in the US or its territories.
Jus Sanguinis: The law of blood, meaning one or more of the parents is a US citizen and has met the residence requirements to pass on citizenship.
These are long standing and well established in law.
Does that automatically make the child a German citizen?
German law determines that and has no bearing on US citizenship.
Thanks for that.