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Are you saying that any problems with the world government would be handled successfully by "people power" revolutions? But you also acknowledge that the reason why secession in the US is "inconceivable" is precisely BECAUSE of its gigantic military establishment. That issue would still be there with a world government, because they'd have the monopoly on force. I'm not clear what your solution to the issue of peaceful secession is.
If there was an alleged world state in which there was a gigantic military establishment, with forces recruited from a single nation, distributed in a global archipelago of states, overseen by an elaborate network of satellites, electronic eavesdropping and drone murders, what you have is simply a new-fashioned empire.
On the other hand, if a world state were a genuine world state responsive to the majority, it could not recruit from a particular element of the population, meaning it could not create an military that viewed itself as different from the rest of the population. Since there would be no other armies to defeat, it is doubtful that it could manage to assemble the massive forces needed to oppress large populations. It could not even easily place military bases. Nor can it ignore civil rights in the name of national security.
But, the real question is not how to peacefully secede from a corrupted world state no longer responsive to the majority. The real question is how a local population reclaiming the right to wage war is going to help. I don't know the best way to revise local government boundaries and what kinds of autonomous powers to grant subdivisions of the world state. There are great tasks for posterity to achieve. But it is not at all clear that for a local population to arm itself and claim the legal and moral right to kill massive numbers of supposed enemies is in any way a practical or moral solution to any political problems.
Is it:
A) Yes, it'd be allowed
B) it'd be suppressed with the necessary amount of force
C) there'd be no need for secession
D) it depends on various factors, such as popular support
C) strikes me as a cop-out, because you can easily imagine any small group in any society, even a happy, prosperous one, wanting to establish their own government
Why would their happiness and prosperity make them want to pay for an army? Except to be able to defy the majority of humanity, that is?
Again, whatever system of local, regional, continental (?) governments and whatever distribution of powers amongst the branches of the state, they must be amenable to democratic revision, according to the will of the majority. The majority includes all humanity, especially when it comes to issues of war. There is no sane definition of democracy that ascribes a veto to a plurality in a particular region.
Thinking that a particular nation must have its supposed rights unchallenged is bizarrely metaphysical (no matter how common it is!) It is just the prettified version of the political conservative principle that some people have more rights than other.
Brings into question how it would be done. The decision could be made solely and independently by a majority of the people in the area to secede, by a majority of the world's population (a planet-wide plebiscite), or by the world government itself.
It would be easy to imagine some people wanting for the world government to strip the former sovereign nations of all their military armaments, basically from day one. Perhaps accompanied by elimination of the right for private citizens to legally possess firearms. This would make suppression of the populace quite easy.
Even if no group avails themselves of the possibility, the ability to secede should exist.
If a world government was legitimate, no one should want to secede from it. That's my position.
If (when) China joined the world state, would say Tibet then separately have the ability to make their own choice on the matter? And if Tibet was initially swept in by China's decision, could Tibet as a people/territory subsequently, politely and peacefully decline to remain with the world state?
If the initial entry was illegitimate, that might form a reason to wish to secede.
More craziness. Just a couple of points to illustrate.
Disarming the population does not make their suppression quite easy. Antilabor laws make suppression of the people quite easy, which is why political conservatives are universally antilabor. In revolutions, the people, even when arms are not prohibited, for the rather practical reason that they generally can't afford many weapons, end up acquiring their weapons by force from the military, which collapses in a revolution.
(The days when weaponry was relatively cheap and really meant that the private citizen could meaningfully participate in a militia that could kill Indians or hunt runaway slaves are long gone. In ancient Rome, when weaponry was dear, ownership of arms meant you were higher-class, with special political privileges. In mediaeval Europe, owenership of arms meant you were a knight, not a serf. Armaments are not the foundation of freedom, they are the instruments of oppression. That is why the very ideal of a peaceful world is anathema to political conservatives.)
The Tibet/China example highlights precisely the moral advantage of a genuine world state. The people of Africa, the Americas, Europe, etc. have no interest in exerting force on Tibetans to keep them in a particular political arrangement with China. The logistical requirements imposed by differences in language alone would tend to make it more convenient to have a separate district government. It's China that would need to secede from a world state to continue to exercise undue influence in Tibet! And there would be absolutely no benefit to the Tibetans to devote themselves to paying for a military that would threaten their own freedoms, especially one that would have to be ready to attack the entire world!
The political conservative opposition to a world state, even as an ideal (the thread topic or have some of us forgotten?) is similar to the slavers' opposition to Hamilton's standing army: A world state might interfere with the local rulers' privileges.