Test a historical cause claim
Identify alternative explanations before attributing a change to one event.
Supplied materials
- Original fictional Willow records: a bus route began in 1940. Market visits counted by a clerk rose from 200 per month in 1939 to 260 in 1941. Over the same period, the market added ten stalls and the town grew.
- An invented historian writes: “The bus caused the entire increase in visits.” These are fictional records for reasoning practice.
Learn the idea
Chronology is necessary for many cause claims, but “after” does not mean “because of.” A change may have several contributing causes, and the measurements may also have changed.
Historical evidence rarely supplies a perfectly controlled experiment. You can still compare explanations, seek independent records and state a conclusion with an appropriate level of certainty.
- Calculate the observed change in the clerk’s count.
- List two changes that occurred alongside the bus route.
- Explain which part of the historian’s claim goes beyond the evidence.
- Suggest a useful comparison, such as similar market records without a new route.
See the method in action
Visits rose by 260 − 200 = 60 per month. The timing makes the bus a possible contributor, but added stalls and population growth are alternatives. The records do not isolate how much each factor contributed.
Check your reasoning
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See the answer and explanation
The bus is a plausible contributor, but the supplied records cannot assign the entire increase to it.
The records show an increase alongside several changes. They establish neither the bus’s exact effect nor that its effect was zero. Additional comparisons could help distinguish explanations.
Take it further
Imagine the clerk switched from counting people to counting entries. Explain why measurement consistency must be checked before comparing the totals.
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Longer courses for learners ages 14+
These related courses have their own preparation and projects. They are not early-grade assignments.
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