[Captain.Remy]

It's in the Human nature to feel threatened, jealous and worried. The world is too different for people to live peacefully.
I actually think we went from a "culture" focussed battle which was more about convincing each other what they believe in is the best to a more "financial" battle which consists of having the most resources to get further.
If you take pretty much all the wars since the WW II (may I add this one was both cultural and financial focussed), they've been financially focussed (Kuwait, Iraq....).

Wars' reasons are meant to change, the rules tend to change. As for now, money is all that matters and it will keep dividing people for a very long time. When money won't be the purpose of wars, then it will be something else etc...