Although the 20th century wasn't peaceful by any means, there is some evidence that violence has decreased proportionally to the population. Steve Pinker's well

Although the 20th century wasn't peaceful by any means, there is some evidence that violence has decreased proportionally to the population. Steve Pinker's well researched The Better Angels of Our Nature is a good tome on the subject: https://en.wikipedia.org/wiki/The_Better_Angels_of_Our_Nature https://en.wikipedia.org/wiki/The_Better_Angels_of_Our_Natur...