aronnax
Let your spirit be free
Battle of Talas imho.If this battle didnt happen...Well I dont know.
Lets see...If The battle would not fought, CHinese Presence would have increased and remain in Central Asia. Who knows, maybe a Sinonized Central Asia may appear and push forward and west into Europe for control of Trade Routes and Diplomatic Dominance. However this would alarm the Caliphate which would most likely fight China, which would lead to a battle at the edge of both empires which bewteen two Giants which may end in total defeat on both sides, which may end both Chinese and Islamic presence in the region.
Without this battle, paper may not been transferred over to the Arabs who subsequently wont transfer to Europe. No paper, no need for the printing press, slower Reinassce, no quick spread of the Reformation, no Protestant England, no protestant England, no extremist protestant English running to America to escape them, no english colony founded, no American Nation.
Conclusion, Huge effects