Use Mitenbuler, printed pp. 23–24, and preserve the source’s own evidentiary caveats.
Thorpe’s December 19, 1620 letter describes a drink made from Indian corn but does not explicitly say it was distilled. A separately transmitted estate inventory lists an old copper still; equipment ownership does not establish the finished drink’s method or identity.
September12 primary-transcription comparison distinguishes corn drink from explicit distillation. Inventory independently supports equipment ownership, not a whiskey recipe.
Treat the date as an early-colonial evidence window. Do not call the product bourbon, document aging, or claim a first without stronger primary evidence.
Separate direct documentary wording from inference. Neither text proves the first American whiskey.
Used and link-verified on the public history page “Colonial Distilling — Scattered Evidence, Adaptation, and Grain” on 2026-09-02. Retain the recorded qualifications in future revisions.
Claim
Thorpe’s December 19, 1620 letter describes a drink made from Indian corn but does not explicitly say it was distilled. A separately transmitted estate inventory lists an old copper still; equipment ownership does not establish the finished drink’s method or identity.
Evidence judgment
Mitenbuler’s cautious secondary account is now supplemented by the letter and inventory distinction documented in 
Boundary
The evidence does not establish bourbon, maturation, a documented recipe, or an uncontested first.
Drafting guardrail
Use “early evidence” or “possible early corn-spirit experimentation.” Never state that Thorpe invented American whiskey.
Readiness decision
Ready for Drafting with Moderate evidence and High confidence.