Little Hawk's list of historical causes for war:

"a shortage of arable land

a shortage of drinkable water

poverty

overpopulation

starvation

oppressive political regimes and philosophies

xenophobia, tribalism, and nationalism

greed for material gain at someone else's expense

major financial and trade opportunities to be secured by war

entangling alliances (which are based on common interests)"

Yikes. Not one of those conditions, worldwide, has been eliminated or even improved. In fact, the first six in the list are worse today and growing more so, every day.