electrisity
It is probably impossible to argue what had the greatest impact on world history, it did of course have a massive impact and we still see its legacy now, but there are other things that have had an impact that is still with us (from the Roman Empire through to the Cold War). I think this probably counts as either a question that cannot be answered, or one that should be answered simply as "No".
The development and use of the microchip, leading to computers and cell phones.
Spain had the greatest impact on Latin America.
He made a quick judgment about the British and decided that their destruction was cause the greatest revolution in the history of the German Federal Government.
electrisity
Not true it was the greatest impact. It is just part of history. There are many things that have made a greater impact.
Roman Catholicism.
WW1
Fourteenth Amendment
fourteenth amendment
Fourteenth Amendment
The Islamic Caliphate which had the greatest impact on history is the Abbassid Caliphate which reigned from the 750 C.E. up to 1258 C.E. when they were conquered by Hülegü Khan (brother of Kublai Khan and grandson of Genghis Khan).
slavery
It is probably impossible to argue what had the greatest impact on world history, it did of course have a massive impact and we still see its legacy now, but there are other things that have had an impact that is still with us (from the Roman Empire through to the Cold War). I think this probably counts as either a question that cannot be answered, or one that should be answered simply as "No".
The development and use of the microchip, leading to computers and cell phones.
Hernan Cortes