CBC has an decent analysis of WWI:
http://www.cbc.ca/news/world/the-100...-war-1.2721971
It is interesting how the Balkan wars of the 1990 and much of the problems in the ME today can arguably be traced back to WWI.
The death toll is unfathomable to me still. It's also crazy to me how many died of disease and not directly from combat.