Addendum

Actually those all lead to mechs. Pranked!

Turning Points in History to Consider for Alt History

Stamford Bridge
Jugurthine War
Ferdinand and Isabella (make both women)
Alexander the Great (dies earlier)
Alexander the Great (dies later)
Alexander the Great (still alive)
Isaac Newton (discovers anti-gravity; leads to mechs)
Christopher Marlowe (wins bar fight, becomes emperor)
Pyramids (much bigger; aliens show up)