A bored genie approaches you with a challenge
He hands you a tablet that allows you to see into an alternate universe exactly the same as ours. He gives you the task of removing 1 event from the recorded human history with the goal of creating the most drastic butterfly effect you can. The details are as follows:
The alternate world is exactly the same as ours. All discoveries, inventions and historical events have played out in the same way as in our world at the time of the offer.
The event you remove must be specific and fit within a well defined time span of 24 hours For instance, you can say “I prevent Archduke Franz Ferdinand from being assassinated on June 28, 1914”. You cannot say something vague like “I prevent WWI from starting”.
The event you choose must be a part of recorded human history. So “Preventing meteor that killed the dinosaurs from hitting earth” would not be a valid event because humans weren’t around then.
You can see the effects of having removed your event on the tablet the genie gave you earlier. If the genie thinks the butterfly effect from the event you chose is significant/entertaining enough, through whatever arbitrary criteria he sees fit at the time, you will receive $1,000,000 USD or the equivalent in your local currency tax-free.
So, what historical event do you remove to entertain the genie, and what effects do you think it will have on the modern day alternate universe?