Answer the following question, with explanation first.
The first constitution was written in 1820 in only 38 days. The Missouri Constitutional Convention (1861-63) was elected to decide on secession, and made no changes to the constitution.\n\nWhen was the first missouri state constitution written?

1820
The relevant sentence in the passage is: The first constitution was written in 1820 in only 38 days.

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The answer is 1820