What is the largest cause of war throughout history?

Is say, it's economic, but that is power

General Dwight D Eisenhower: "We never learn."
Power.

I can't think of a time when religion was not a dominant player in war and conflict or at the very least used to "justify" a position by one or more parties.

The causes for war are almost universally population pressure and the thirst for resources. Don't mistake the cause of war for the justification. For example the Crusades were more about getting rid of extraneous third sons who were causing problems in Europe and controlling trade routes then they were about religion. True believers are just VERY useful tools to the shrewd political leader who uses "the word of god" as a propaganda tool.

Wanting whatever we ran out of, that they got plenty of.

I voted Power, but I see how every other category would also come into play. If your going to start a war to assert your control then your also looking at the control of resources, geopolitical influences, religious ideology, and sometimes revenge can play a factor.

One can say all of the above. I feel in the old days, it leaned more towards power and resources.

Same three things start a war. Religion, money, and resources.

Religion

I'll take People for 500 . . .

But if we want to break it down I believe "Power" is the most correct answer, because everything else can fit under its umbrella. *Revenge has to come from an initial grievance, Politics is the "science" of exerting influence and power through social means, religious issues come about because some believe that their side being right is important enough to come at the expense of others, and finally resources are another form of power as having control of them is a form of power.

In the end it all comes down to the desire to be in charge and calling the shots, the belief that "you" should be on the throne and not "them," typically with complete disregard for the fact that neither party is qualified to rule and dominate the other.

Humans are equal to each other, and equals cannot rule over their equals. So, it is the quest for power, to become greater than one's equals, that is the root cause of war (although it actually goes a lot farther than that) which is a means of forcing dominance through force and strength of arms.


*This is a simple overview, if you want something broken out in detail let me know.