The Erupton of Thera
Black Death
Smallpox among American Indians
Gutenberg Bible
Constantines conversion to Christianity
Napoleon in Russia
Darwin publishes the Origin of Species
The destruction of the Library at Alexandria.
The Fall of Carthage
Hiroshima
This is a VERY Eurocentric list. I number of these can be bumped for other events in other locations of which I am far less familiar
What are the top ten dramatic world changing events that happened in the world history?
well a couple contenders for #1
Agriculture
Writing/Recordkeeping
Religion
Music
but overall events, hmm...
Atomic bomb would be one, agricultural societies (permanent settlements), and religion and its use.