As oppose to what most believe we are living in incredibly peaceful times. And this graph doesn't include WWI. The data comes from here http://www.pcr.uu.se/research/UCDP/

And if you have any doubt that the world is becoming more peaceful here is a list of estimated casualties of all wars of humanity http://en.wikipedia.org/wiki/List_of_wars_and_anthropogenic_disasters_by_death_toll

Most of these wars were taking place when humanity was less than 20% of the 7bn people we now are.
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