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Did a single wrong turn by a chauffeur in Sarajevo cause the death of twenty million people in World War I? Or was Europe already a powder keg destined to explode regardless of who pulled the trigger?
To answer questions like this, historians use second-order concepts—analytical frameworks that examine how we make sense of historical patterns rather than just memorizing dates.

The Hierarchy of Causation

In historical enquiry, causes are never flat or equal. Historians categorize them by their temporal depth and operational power.
A structural cause is a long-term, deep-seated condition—such as economic inequality, imperial rivalry, or demographic shifts—that establishes the preconditions for change over decades.
A catalyst trigger is a short-term event or decision that rapidly accelerates these structural tensions into an active crisis.
In 1946, French historian Fernand Braudel formalized this distinction by contrasting the slow-moving longue durée (geographic and economic structures) with l'histoire événementielle (surface-level political events).
A catalyst trigger cannot create an outcome out of nothing; it merely discharges the potential energy already built up by structural causes.
How do we evaluate whether an event was a genuine cause or merely an incidental coincidence?

Evaluating Weight: Relative vs. Necessary Causes

To test the strength of a causal claim, historians evaluate whether a factor was a necessary cause (the outcome could not have happened without it) or a sufficient cause (the factor alone was enough to guarantee the outcome).
We test this using counterfactual reasoning—asking: If we remove this single factor while holding all others constant, would the outcome still occur?