Why did WWI start?
This article goes into the reasons for WWI: http://en.wikipedia.org/wiki/WW1 In general, all wars are about wealth. You either want the wealth that the neighbor has, or you want him to not take your wealth. Wealth may be measured in land, mineral resources, harbors, ports, or even slaves, but war is fought to control wealth. Even when a war is supposedly racist, such as the genocides against the Kurds and Bosnians, the real goal is to take their land, buildings, farms, etc. Look at how the Nazis used the belongings of the JEws.
