As someone educated in Western American history: arrgghh.
This author is all over the map, cherry picking weird theories while omitting immense amounts of data. He could probably argue that the 20th Century wasn’t violent at all, except for Wilson, “Ol’ Frank” Roosevelt, and Nixon.
After finding the biography of Thomas J. DiLorenzo, much is clarified. He is an economist, not a historian, and he is a kook. He has no idea of what he is talking about.
http://en.wikipedia.org/wiki/Thomas_J._DiLorenzo
Lot'a paper validating him, though