The most accurate type of text to use for writing a town history would be informational or expository. Both of these styles aim to present factual information clearly and logically.
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Informational texts provide factual content, typically without the intention of persuading the reader.
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Expository texts aim to explain or inform about a topic in detail.
If you had to choose one, you might prefer informational as it directly reflects the intent to convey historical facts about the town.