[sourcery]

Any person physically on US territory is subject to US jurisdiction, unless that person has diplomatic immunity, or is an American Indian on his tribal land, where such land is recognized by treaty as the sovereign territory of the tribe. Persons who can rightfully argue in Federal court that the court has no authority over them are the only persons not "under the jurisdiction" of the US.

[Reaganwuzthebest]

"Subject to jurisdiction" means more than than just physical presence on the soil, it entails sworn allegiance to the country as well as being a citizen. That was confirmed by the fact a tribal woman could give birth in a city hospital but not have her kid granted automatic citizenship. Why not if he or she was born within the territory of the country and subject to the jurisdiction of the US?

The fact is there were exceptions to the 14th Amendment, even when those kids were born in a city hospital on US soil. Children of illegal aliens are granted automatic citizenship not because of any court or legislative mandate, but out of tradition and only that.