Generally speaking rights are extended to all inside the border of the US because it is impossible to immediately tell who is and is not a citizen. There is no

Generally speaking rights are extended to all inside the border of the US because it is impossible to immediately tell who is and is not a citizen. There is no federal citizenship ID or database. So the government finds it easier to simply assume anyone inside the US is a citizen to avoid constitutional/legal issues. Outside of the US the chances of running into problems with a dragnet is much lower so they just do it.