Posted 2014-February-18, 00:59
I think the concept is interesting, in that even trying to answer it gives rise to so many possibilities as to bring home how impossible it is. Reading the answers, on the other hand, shows how limited some of us are. The notion that 9/11 is one of the 3 most important events in history is laughable if it wasn't so revealing. On a slightly broader canvas, the idea that the WWI was one of the 3 most important events in human history isn't much better.
I'd give you 9/11 and WWI combined and argue that the Punic Wars had infinitely more significance in terms of how the modern world is today.
But one could easily go back a little further into history and argue that the wars in the middle east that gave rise to the independence of Carthage from its Phoenician origins led to the punic wars, so maybe we need to name those wars instead.
Except, those wars arose themselves out of earlier and still earlier conflicts. Where do we draw the line?
As for the industrial revolution, it wasn't an event even within the fuzzy definition that allows one to call a war an 'event'. It was an era: an era marked by a series of gradual inventions and improvements. The steam locomotive or the steam power plant for factories weren't invented out of nothing: those engines were the result of decades of tinkering seeking to improve and render more versatile a device developed to pump water from mines. Agriculture was probably also a (very) gradual evolving sort of concept (see Jared Diamond) rather than an event, as was urbanization and nation building.
If I had to name an event as pivotal, I suggest the first time that someone thought of the idea of using some form of visible mark to connote information....probably a number but maybe a name or initial. Of course, that invention may have died away only to be re-invented by some other person with no notion that it had been done before.
As a second choice, the invention or discovery of the notion of zero. Again, who knows how many times that happened before it 'took'?
Now, maybe these don't fit the OP, since these events happened in pre-history
Inventions of things or even ideas are problematic since, as Richard observes, most ideas will arise many times, and that may be true for my suggestions as well. Liebnitz invented calculus at almost the same time as Newton, and arguably slightly before. Wallace thought of evolution operating through the winnowing effect of natural selection years after Darwin but before Darwin had published, The Wright brothers flew a powered flight for the first time, but others around the world were actively working on the problem and would have solved it within a year or two at the outside. The same is true for nuclear power, spaceflight and many other 'firsts'.
The more one thinks about it, the more one is driven to realize that maybe there really are very few 'new' things under the sun, or very few 'events' as opposed to processes that unfold over years, through the usually unco-ordinated actions of many people, few if any of whom have any idea of what their efforts will bring forth.
'one of the great markers of the advance of human kindness is the howls you will hear from the Men of God' Johann Hari