William Clark: Principal Cartographer

William Clark served as the expedition's principal cartographer, turning daily observations, measurements, Indigenous knowledge, and earlier geographic records into an evolving picture of the trans-Mississippi West.

His maps were not merely illustrations of the route. They were working instruments—used to navigate, compare accounts, record tributaries and landmarks, and communicate what the expedition believed it had learned.

For Unfinished Country, the map is both evidence and dramatic object: a record of discovery, interpretation, ambition, and claim.