good point in good question. Then again, all these questions seem to turn out to be the same questions -- what is the nature/topography of this extended consciousness realm? is there a hierarchy?
I think we have to be careful not to take 911 in the purely historical it is delivered to us in. As an event it is pivotal for the US and the rest of us, and so we must see the deeper hints this is the case.
Strictly speaking the new century began on 1/1/01 - or 11 if we use the logical notation. So the 11th day of September, denoted as 911 not only adds up to 11 but is an emergency services call number. And the twin towers also represent 11. This isn't 'coincidence'. Its a signal that here a lot more is going on than the merely obvious - and by this I do not mean what conspiracy theorists bang on about - sorry conspiracy folks but I have been down that rabbit hole and found nothing to persuade me.
One huge message we must take is that 911 was a wake up call as well. Radical asymmetry triumphed on the day and all I can say is that each day I am grateful that 'terrorists' are nowhere as nearly equal in their imagination. What happened on 911 was symbolic. It was an attack on symbols, an d let us pray that attacks of this kind remain focused on symbols - because all 'advanced western countries' are profoundly exposed to serious malicious assault. And to any pro-Trumpian anti-Deep State fans let me be clear. Without that 'Deep State' you social infrastructure would be already shredded.
But back to the metaphysical. 911 alters the balance of powers and through that it alters how we operate as a culture. That one attack on a symbol has fundamentally transformed a culture. Now I am no fan of terrorism [which I don't think 911 really is] or Bin Laden, but we have to look at the absolute assymmetry. A bunch of non-professionals penetrated the security of the most armed nation on the planet. Bin Laden is said to have said that he wanted the US to squander blood and treasure. That happens and continues to happen.
The power of the state is broken. Non-state militia can wreck havoc using asymmetrical aggression to attain psychological and political objectives. This is now the norm. Bin Laden was the inventor, but the exemplar, and hence the symbol. In 19 years non conventional asymmetical conflict has become the norm - but now states can conceal what they do via non-state actors. Everything has changed.
And this is the point. Since 911 we have had the rise of [anti]social media. Psychological and political violence is now commonplace. The counterpunch is personal authenticity and concerns for justice and equity. This drawing up fracture lines between two value sets that are not the present conservative versus progressive [there are utter idiots on both sides] but a more moderate differentiation that has yet to express itself coherently. That's a few years off. We don't presently have the ideas or the language.
To the extent that 911 marks a boundary between 2 ages itnhas echoes down the various pathways of our reality - political, economic, technological, cultural, spiritual. All these and more constitute the threads that weave together the fabric of our reality.
In Australia I woke up early with an intent to watch Star Trek I had recorded on my VHS recorder. I was pissed off. Instead of JLP I got a boring US city landscape - and suddenly the twin towers and the consternation of the news hosts as they became aware of what was going on.
I knew then the world had changed. I understand that for many now this is part of their reality and hardly a radical event. It was transformative - on every level. It is important that you get that.