Marcus Kline: The Great Famine of 1628. Recurring plague in Central Europe. The Thirty Years' War running concurrently from 1618. Three massive historical forces inside one generation — and no one alive then had the distance to tell them apart. The question we're sitting with today is whether historians now actually can.
Ben Okonkwo: Hm. And the honest answer might be — only sometimes. With significant caveats.
Marcus Kline: Now, the fallacy has a name. Post hoc ergo propter hoc — after this, therefore because of this. Historians know to fight it. But knowing the trap and — actually, no — knowing the trap's name doesn't mean you've cleared it.
Ben Okonkwo: Right. Because temporal clustering — war, famine, plague all arriving together — that's not evidence of a causal chain. Those could be three independent processes that happen to converge. The sequence is documented. The mechanism is the part you have to demonstrate separately.
Marcus Kline: Mechanism, temporal order, documented transmission. That's what historical causation actually requires.
Ben Okonkwo: And honestly? Proving all three — I'm not sure that's ever fully clean.
Ben Okonkwo: And that's — I mean, that's actually where Leopold von Ranke matters. Because before him, historians were largely working from narrative compilations. Other people's digests of events. He said no — get the original document. The letter, the government record, the thing the actor produced at the time. That's the evidentiary floor he built in the 19th century.
Marcus Kline: The archive as the witness.
Ben Okonkwo: Right. But here's — wait, actually this is the part that troubles me. The mechanism of influence, the three-part test you named — knowledge, response, documented transmission — that standard only works if the primary source is telling you something real. And source criticism exists precisely because it isn't neutral. Selection bias, descriptive bias, the interests of whoever wrote it.
Marcus Kline: Consider a Thirty Years' War commander. He writes a letter — says he's responding to the famine. That proves he said he responded. It doesn't prove the famine determined his decision.
Ben Okonkwo: Exactly. And that's — that's not the same claim. Causal-intentional explanation requires conscious knowledge and documented response, sure. But documented response and actual causal mechanism are different things entirely.
Marcus Kline: So the vulnerability in the method is that the archive is the only witness, and the witness had reasons to lie. Or simplify. Or rationalize after the fact.
Ben Okonkwo: And that's — okay, the functionalism-intentionalism debate in Holocaust historiography is where this becomes, I think, the hardest version of that problem. Because you have two serious schools of historians. Same archive. Same documents. And they arrive at fundamentally opposite causal narratives.
Marcus Kline: Same archive. Opposite conclusions.
Ben Okonkwo: Intentionalists say Hitler consciously planned the extermination — the ideology was always there, the rhetoric is documented, and the invasion of the Soviet Union in 1941 is part of a deliberate sequence. Functionalists say — wait, actually no, look at the occupied Eastern Europe evidence from around 1941, 1942. The transition to mass extermination came from incremental decisions at lower bureaucratic levels. And there is no single definitive Hitler order in the archive.
Marcus Kline: The document isn't there. Which is — that absence is doing enormous work in the functionalist argument.
Ben Okonkwo: Right, but here's where I get stuck — is that underdetermination of the evidence, or is causation itself genuinely ambiguous here? I mean, those are different problems.
Marcus Kline: And counterfactual reasoning is supposedly the fix. Ask — if Hitler hadn't invaded the Soviet Union, does the extermination policy still emerge? But that question can't be answered from the archive. You've left the documented record entirely.
Ben Okonkwo: And then — this is the part that genuinely puzzles me — the scale problem. Whether Hitler's intent or bureaucratic drift looks causal depends on where you zoom. Local level, you see functionaries making decisions. Civilizational level, ideology looks inevitable. The camera position is a methodological choice, not a neutral given.
Marcus Kline: And that's — I think that's what I keep turning over. Because the evidentiary standard Ranke built, mechanism plus transmission plus documented intent — it's rigorous. It's the best we have. But the narratives that *feel* most inevitable, the ones that feel like they couldn't have gone any other way, those are precisely — I mean, almost by definition — the ones that have outrun what the archive can actually support. The functionalism-intentionalism debate has been running for decades. Same documents. The causation is still genuinely underdetermined. And war, famine, plague clustering in the same generation — those might just be tragic accidents of timing. Not a chain. And accepting that changes what kinds of explanations are even possible.
Ben Okonkwo: Yeah. That's — uncomfortable.
Marcus Kline: And yet the discipline keeps doing the work anyway.
