This is a whole-sale shredding of the constitution.
Forgive a possibly silly question but in what sense does being "in" Florida mean you are bound by Florida state law when you leave? How long did you need to be in Florida before you became bound by its law? What if you fall pregnant after you left? Can you be in breach without ever having been in Florida, and a LEO can therefore take you there and charge you?
https://www.texastribune.org/2024/02/09/texas-abortion-trans...
But let's look at the birthright case that this ruling comes from.
Let's say Nevada state sues the federal government. The ruling is made from their district court that birthright citizenship is clear and this EO is illegal. An injunction is placed against the EO.
The state of Kentucky does not sue.
Previously, the Nevada court injunction would apply nationally. The EO is unconstitutional. EOs are federal, the constitution is federal. So, clearly, it is unconstitutional everywhere and must be stopped.
The federal government can then go through several layers of appeal to prove that this was a mistake and the EO is legal. All the way up to SCOTUS, who makes the final judgement and cannot be appealed.
What SCOTUS just ruled is that the injunction against the federal government only holds the EO from applying to the specific litigant. That can be a whole state, a group of people, or a single individual. Even though the EO is now ruled unconstitutional in the eyes of the federal court de jure, it is de facto still the law of the land by default to all other entities.
And it gets worse. A litigant cannot appeal to the next court, only a defendant that loses. And SCOTUS only has to address cases that are appealed. There is no mandatory reconciliation process. That means, for an infinite amount of time, individual people will have different constitutional interpretations that require a background of every case that has ever involved them.
So, back to our example. If the federal government loses in Nevada and there is no ruling in Kentucky... What the fuck even happens? Someone is or is not a citizen, that's literally the point behind Dread Scott and Obergfell, but they've contradicted those cases and invented a constitutional superposition.
So, in Nevada a naturalized citizen with non-citizen parents is... A citizen? Because of the injunction? And what if they're in Kentucky, but were born in Nevada? Or vice versa?
But, no, this isn't a state law. It's federal. Which means it doesn't matter what state you're in when you do it, it's still illegal. And federal LEO had the authority to try you in a different location than where you were arrested. So - born in Nevada or Kentucky, where you are now, that doesn't matter. Effectively, you have no citizenship. Again, this is quite literally Dread Scott.
This SCOTUS ruling effectively disables the constitution and dissolves the union of states. I'm not being dramatic, this is also the opinion of Sotomayor.
Curiously, this does not actually extend to other cases. So, say, if McDonalds gets in trouble and an injunction placed against them. That still applies universally.
Britain its mostly UK Law, with bits of "no, thats English law, this is Scotland" on top. I emigrated so long ago the national appeals structure has changed and I don't entirely understand when it applies and overrides. But immigration is clearly nation-wide.
I think "birthright" citizenship is pretty alien to most legal regimes. Ireland might be the one people think about in the Europe/Britain context. Used to be a lot of pregnant women flying in late stage. But, thats not to call it wrong or decry what the appeals in the US were trying to do. It was amended into the constitution a very long time ago, and until recently what the current WH is trying to do was seen as "fringe law" but now seems core.
However, there is no just world where you can revoke citizenship from existing Americans. Especially under the vague terms they used.
Furthermore, the constitution itself is what defines it in clear language. Birthright citizenship can only be changed via constitutional amendment.
Some people with no lived experience of "homeland" have been sent "back there" and in related cases, Australian indigenous have been threatened with never having had citizenship because of association with neighbouring countries. The courts came down pretty heavily on that one thank goodness.
[1] https://www.npr.org/2025/06/30/nx-s1-5445398/denaturalizatio...
https://www.yahoo.com/news/republicans-test-red-line-denatur...