During that period local rulers, either powerful families or military<span> warlords, dominated the land, while the emperor was merely a figurehead and not a significant political presence. Society was divided into two main classes in Feudal Japan, the nobility and the peasants.</span>
It was a event that led up to the American civil war.
Answer:
After the Holocaust, the world vowed to never again permit the crime of genocide. In the many decades since, genocide and mass violence have played out again, and again.
All I really know about Karl Marx is that he didn't like capitalism. So I would have to say the invention of capitalism.
