The big problem I see is creating this 'underclass' of people who don't have the rights of a full citizen. I mean, it's normal to do this when someone immigrates; depending on visa, sometimes they can't even legally work. Or they can work, but they are put in a legal position, for instance, where they have to leave the country 15 days after they get fired.

But, to me? the really bad thing would be to make that hereditary. To say you don't have full citizenship because your dad didn't have full citizenship, even if you have never set foot outside of America.

"jus solis" means that whatever legal restrictions we place on immigrants will fade with time, as they die off.