All of them. Even the Crusades were more about control of trade routes than anything else. "Causes" are merely a device used by Daddy Warbucks to dupe young men and women into getting themselves killed and maimed in order to satisfy that greed.
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greed
John Flinken caused the conflict
The two western countries whose rivalry have caused several wars would be England and Germany. They have fought three major wars in the last 150 years.
Countries go to war for many different reasons, some dictatorships never reveal why they invaded a country. Wars are mainly caused by greed (money, oil). Land disputes and reliougous disputes usually top it off.
Rome