Feel free to debate below but I think Ive compiled a pretty good list and brief explanation why
1. Agricultural Revolution: paved way for the rise of permanent societies and civilizations
2. Industrial Revolution: Laid way to consumerism and mass production of goods
3. "Cyber" or Computer Revolution: We are still living at the tail end of the beginning of this event but it is reshaping the way we live and are connected around the world
4. Assassination of Archduke Franz Ferdinand: Turning point that inevitably led to WWI which inevitably led to WW2 (new eras of industrial scale war)
5. Invention of the Gutenburg Printing Press: Dissemination of knowledge on a massive scale
6. American Revolution: Reshaped modern government institutions around the world, paved way for similar revolutions in France and other nations. Democracy on huge platform.
7. Death of Jesus Christ of Nazareth: Marks the beginning of a new religion with an astounding 2 BILLION followers
8. Use of Atomic Bomb in Hiroshima: Beginning of nuclear age and threat of Mutually assured destruction. Potential end to world wars.
9. Invention of Vaccine by Edward Jenner: Cowpox/Smallpox Immunizations save millions of lives
10. Fall of Berlin Wall: Capitalisms power overruns communism in east Germany.
Honorable Mentions: Reformation of Catholic Church, Death of Muhammad, Moon Landing, French Revolution, Invention of Airplane by Wright Brothers, Eluid Kipchoge 2:00:39 ;)