Zeppelins bro
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.
The greatest impact on Canada was as a result of World War II due to Canada's extensive effort in this war as opposed to World War I.
How did Balboa Impact the world
What is Americas greatest contribution to world theater
Zepplins
African Americans and Women
Americans, they are the greatest polluters in the world.
The Wehrmacht, the regular German army, had a greater impact on the outcome of World War II compared to the Waffen-SS, the Nazi paramilitary organization.
bacteria
There were many factors that made the South the worlds greatest producers of cotton. The one factor that did not impact the cotton of the South was the discovery of a new breed of cotton.
_There should be a space between 'the' and 'impact' it should read: "What was the impact of World War 2 on US society?" Soz!_
Evangelical Protestantism
labor-saving devices
The sinking of the Lusitania had a great impact on Americans in that it turned them against Germany.
the Galápagos Islands
it utterly crippled the country