Most, if not all wars, are based on holy war. That, certain religions are bad, or that "god" told that person to carry out certain acts. Heck the original way the American Civil war started was John Brown, believeing the war was a holy war, that he was told by god to protect the north, a terrorist to the south
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Don't really know0
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You can safely bet that about all wars have economical reasons.
God and religion are only tools to convince people to figh, nothing more. Muhammad used that, Europe used that for the Crusades and colonisation. GW Bush and Blair too used that to justify their invasion of Iraq. ISIS uses it.