Most important event in world history?

[Sundiata]

The crucifixion of Christ.

[Borderlands of Rojava]

The moment the first cell appeared.

[Sanghyeok]

Doesn't that feel rather unimportant in the overall history?

Which one of the two?

I would argue both, although the second is obviously more important than the first.

[Weshigtinoa]

depends on how far back you wanna go, this a very vauge question

[Xelsis]

There is a reason that 'prehistoric' is a term-events like the creation of the universe are usually categorized as before history rather than part of it.

The most apparent answer for an actual single event would be the birth of Jesus of Nazareth. Regardless of whether or not one believes in Christianity or not, it both the largest religion in the world and the most historically influential, particularly in heavily-influential Europe, everything from the Renaissance to the development of modern literature and education to the colonization of the New World was shaped by Christianity.

[Takomah]

I'd agree with agricultural development, perhaps the discovery/creation of metal for use in tool making.

[Innovationist Eurasia]

The Gravitational Collapse of the Solar Nebula.

[Kargintina the Third]

The evolution of humans?

[Aequalitatis ac Libertatis]

All of history? Agricultural revolution probably.
Fairly recent history? Enlightenment

[The republic ofTexas and northern Mexico]

I’m going with the Texas Revolution

[New Carthagea]

I'm gonna say the two World Wars. Led to the world order that exists to this day.

[Albrenia]

Having given it some thought, the most important event in the history of the world would have to be the formation of the Earth from accretion. Nothing else counts for preceding the world (and thus not part of its history) and nothing that follows upon Earth would have occurred if it had not formed where it did, when it did.

[Phaenix]

Probably the Pax Romanum. Rome was at the height of its power, and without Rome, the cultures, religions, languages, everything about Western culture as we know it would be completely different. For an Eastern equivalent, the Qin Dynasty, since it marked the beginning of China's rise to power.

[Western Fardelshufflestein]

Oh no, I can only pick one? Well...I guess...it must be when Millard Fillmore lowered the price of the postage stamp.

[Cetacea]

The Great Oxygenation Revolution was the single most significant event caused by an living oragnism. The development of photosynthesis in cyanobacteria would lead to a literally explosion of oxygen that changed the planets atmosphere from a weakly reducing one into the oxydising atmosphere which we experience today.

The increase of Oxygen in the atmoshphere caused atmospheric methane to oxidize into carbon dioxide which reduced greenhouse effect leading to a cooler planet. Oxidisation also allowed for greater biological diversification and the evolution of Mitichondria and eventually the radiation of complex multicellular organisms.

[Freiheit Reich]

The creation of human life by God. The answer is easy. However, most important event not involving God's direct involvement is very difficult and has no specific record. Perhaps when man discovered how to harness control over fire or how man figured out how to use the first simple tool of a stick or stone to help him do his task. Without these first simple achievements, all civilization would not be possible.

[Risottia]

As title says, in your opinion what is the most important event in world history?

The invention of the combustion engine if we're talking humans.

The Permian-Triassic extinction if we're talking amniotes.

The Paleoproterozoic Great Oxidation if we're talking life on Earth.

[Risottia]

Probably the Pax Romanum.

PAX ROMANA.

[Sicilian Imperial-Capitalist Empire]

Mid-October of 1941, when Army Group Center elected to do the Kalinin Diversion. Had they not, it's extremely likely the Germans would've taken Moscow and from there won the war. The Cold War would've been between a Nazi Germany that controls all of Europe directly or indirectly against the United States, with both being equal in industry, technology and resources in a way the USSR was never able to be. Given the German lead in rocketry, I wouldn't have been surprised if they emerged victorious in the Cold War, be it (mostly) peacefully or winning World War III.

The Germans taking Moscow would've led to more problems than answers, and the USSR wouldn't just collapse with Moscow.

The Soviets would've fought hard to continue their struggle, and with the overwhelming manpower advantage, it'd only be a matter of when the Soviets would take back Moscow.

Also, I'm pretty sure Stalin had a plan to blow up Moscow to make it unusable to the Germans much like it was to Napoleon.

[Sicilian Imperial-Capitalist Empire]

The creation of human life by God. The answer is easy. However, most important event not involving God's direct involvement is very difficult and has no specific record. Perhaps when man discovered how to harness control over fire or how man figured out how to use the first simple tool of a stick or stone to help him do his task. Without these first simple achievements, all civilization would not be possible.

Assuming, of course, that god exists.

[The New California Republic]

When mankind's progenitors were first able to communicate ideas to each other.

[An Alan Smithee Nation]

I think it is clearly the creation of the internet.

Plus history only starts when people started writing things down. Before that is prehistory.

[Atheris]

The American Revolution, in modern history.

In post-WW1 history, the decision of Stanislav Petrov not to retaliate against the US.

In pre-modern history, the crucifixion of Christ.

In pre-history, the first language.

In pre-humanity but post-Great Dying, the extinction of the Dinosaurs.

Pre-dinosaurs, the Great Dying.

Pre-Great Dying, the creation of the first multicellular organism.

[Kubra]

My birth, obviously.

[Scherzinger]

the fall of socialism in Europe/The Berlin Wall