Because US has no other form of becoming a citizen other than naturalization.
Also frankly it's a bit silly when you are born to two residents of a country but don't become a citizen. Why does it matter what passports they hold if they live and work in america like american citizens? People being born on the same soil being given second class citizen treatment is pretty despicable imo.
Also frankly it's a bit silly when you are born to two residents of a country but don't become a citizen. Why does it matter what passports they hold if they live and work in america like american citizens? People being born on the same soil being given second class citizen treatment is pretty despicable imo.