Well, it is nitpicking at this point (on may part); but it still would not prevent Global Governance. You can still run different petri dishes under different rules, and be under the same umbrella of Governance. You can even have stand-offs and wars between them. It would probably work way better, than moving everything to the exact same culture of rule (Open Global Governance). There is a/some history of aristocrats and rulers fearing their own public, more than an invasion. As terrible as it may seem, there is a sound logic to sending males to battle other males (a less powerful public, during times of native unrest [especially if wishing to implement radical change]). While this it is really unlikely to have been the case "extremely" often, you can bet it has been used as a kind of population control; acts of straight out genocide being more documented.
America has a pretty strong heritage of having running the Brits out. But, in reality, there is documentation of sizable British forces still being present there, after America won its independence; not long present, but enough to raise questions for some. While I won't say the whole thing was a sham (not nearly well enough informed to deny or support it) you can see the "liberation" of America being a pretty huge selling point, to get plenty of folks risking everything to develop an undeveloped territory. A large quantity of people failed, in the process of developing America. People seeking freedom of religion, freedom to develop experimental utopias, and other enamored by escaping the oppression of their native lands. There is a good chunk of that freedom that has since been revoked. For example, many delighted in the idea of allodial titles; a privileged mostly enjoyed by kings. As the government developed, this type of ownership ideal really kinda disappeared, and is now similar to what is available in many other countries today. This is "JUST" an example; so please, no one run with it as some kind of conspiracy theory. But it does show how blood and bullets could be considered cheap, when your philosophy is that you own it all anyway. What is harder to own, is the beliefs of the people. But, there is a large amount of documentation showing that great progress and success has been had there, for a very very long time.
That aside, thank you for reminding me about "Checkpoint Charlie". I had fun distracting myself by digging into different aspects of it; as is available on the web, anyway.
I could really easily agree with you about "Open Globalized Governance", as opposed to just the idea of a "Functional Globalized Governance". The latter likely only to be entertained speculatively (by the public), while for former being something likely quite obvious to the inhabitants thereof.