

This article is an excerpt from the Shortform book guide to "The Lessons of History" by Will Durant and Ariel Durant. Shortform has the world's best summaries and analyses of books you should be reading.
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What causes war? Is war inevitable and even necessary?
In The Lessons of History, Will and Ariel Durant share what they learned about war in their extensive research of human history. What causes war, they conclude, are the same factors that cause individuals to fight. They also reflect on war and peace in the era of the global communist threat.
Read more to learn a historical perspective on what causes war.
War and History
War is a constant in history, there being only 268 years of no war in 3421 years of history. But what causes war? War occurs for the same reason individuals fight: to compete for more resources and power, for pride, and to survive under threat. Peace is accomplished only through acknowledged supremacy or equal power. “The Ten Commandments must be silent when self-preservation is at stake.”
The state inherits the will of the individual, without the individual’s normal boundaries. The individual is constrained by morals and laws, because the state guarantees him basic protection in exchange for his submission. But the state is unfettered, either because it is strong enough to defy interference with its will, or because there is no superstate to offer it protection.
Nationalism gives added force in diplomacy and war. Improving communication and means of indoctrination made nationalism far more effective and pervasive than centuries past, involving civilians and combatants.
When we consider what causes war, we should consider peace. Philosophers will wax about pacifism, but generals believe that war is necessary and, in the military interpretation of history, the final arbiter. The Durants offer a couple of observations:
- What would have happened to our heritage if it were not protected against Mongol invasions?
- A society that enjoys a long peace may atrophy its martial muscles, making it susceptible to outside attack.

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Here's what you'll find in our full The Lessons of History summary :
- What we can learn from studying 5,000 years of history
- How human nature hasn’t changed over thousands of years
- Why all civilizations, including ours, fall, and why we shouldn’t cry about it