Answer: A. Jean-Jacques Rousseau :)
The most important result the came from Ww1 was the treaty of Versailles in 1919. this became a catalyst to wwii because Germany was forced to pay reparations to the Allies.
Cultural renaissance began in northern Italy, concentrated in Florence, Giotto, who gradually broke through the rigid art of the Middle Ages, making the works more vivid three-dimensional works. It then spread to the south, the impact of Rome is particularly large, and Rome is largely by the Renaissance Pope reconstruction. The Italian Renaissance reached its heyday in the late 15th century, when foreign invasions plunged the entire region into chaos. However, the idea of the Renaissance with the ideal spread to other parts of Europe, opened the Northern Renaissance and the Renaissance of England and so on.
I don't think dropping the atomic bomb on Hiroshima and Nagasaki was either necessary or acceptable. Japan was already weakened by the war and it was obvious that it wouldn't be able to fight much more. That's why America had other options to choose from in order to end the war other than the atomic bomb. However, I don't think their dropping the atomic bomb had much to do with Japan - it was just a demonstration of the US power and a threat to other countries in the world not to mess with it - Japan just happened to be the guinea pig. The atomic bomb led to the deaths of more than 200,000 people in Japan, and to dire consequences in Hiroshima and Nagasaki which can be still felt today, over 70 years since the bombing happened.