Reading every journal at once. What no human has done.
For every date with two or more expedition narrators writing, this database produces a side-by-side analysis comparing what each preserved. Long-form thematic essays trace patterns across years. Every claim cites a specific journal entry. Every analysis is reviewed before publication.
The Silence of Meriwether Lewis: What Clark and the Sergeants Preserved, August 1805–January 1806
For roughly 135 days spanning the Bitterroot crossing, the descent of the Columbia, and the founding of Fort Clatsop, Meriwether Lewis put down his pen. The expedition's most consequential geographic transit survives only through the eyes of Clark, Ordway, Gass, and Whitehouse — a documentary absence that shapes everything we…
Read the analysisFeatured analyses
A curated mix — thematic essays, per-figure deep dives, and rich multi-narrator dates.
Diet Across the Expedition: A Seasonal Analysis
From the bison-rich winter at Fort Mandan to the salmon and wapato of the Pacific coast, the Corps of Discovery's diet shifted dramatically with season, geography, and Indigenous…
Sacagawea: The Shoshone Interpreter of the Corps of Discovery
From her recruitment at Fort Mandan in November 1804 to her family's farewell at the Mandan villages in August 1806, Sacagawea — the young Shoshone wife of Toussaint…
Cameahwait: The Shoshone Chief Who Saved the Expedition
Brother to Sacagawea and chief of the Lemhi Shoshone, Cameahwait provided the horses and guidance without which the Corps of Discovery could not have crossed the Rocky Mountains.
Twenty-One Horses and a Settler’s Eye: Reunion at the Twisted Hair’s Lodge
On May 9, 1806, the expedition reunited with cached saddles, powder, and most of their horses at the Twisted Hair's lodge. Four narrators record the same day with…
One of the Worst Days That Ever Was: Three Voices on a Tempest at the Netul
On a storm-lashed return from an elk hunt to the half-built Fort Clatsop, Clark, Ordway, and Gass each recorded the same drenched, wind-battered day — but with strikingly…
Three Villages, One Council: Diplomacy and Spectacle Among the Arikara
On the Missouri near present-day Mobridge, four expedition narrators record the same Arikara council with strikingly different priorities — ethnographic detail, diplomatic protocol, domestic hospitality, and the unsettling…
Pickets, Pelts, and Paper: Four Pens at Fort Mandan
On a moderating December day at Fort Mandan, four expedition journalists record strikingly different priorities — from picket construction and frostbitten guard rotations to game tallies and cartographic…
An Abandoned Arikara Village on the Missouri
On October 6, 1804, four expedition narrators describe the same abandoned Arikara village near the Cheyenne River. Their accounts reveal striking differences in observational detail, ethnographic curiosity, and…
Thematic essays
Long-form analyses that cut across many dates — diet, illness, language, weather, copying patterns, naming conventions.
Diet Across the Expedition: A Seasonal Analysis
From the bison-rich winter at Fort Mandan to the salmon and wapato of the Pacific coast, the Corps of Discovery's diet shifted…
Diet Across the Expedition: A Seasonal Analysis
From buffalo feasts on the northern plains to dog meat purchased on the Columbia and elk steaks rationed at Fort Clatsop, the…
Per-narrator studies
One essay for each expedition diarist — their distinctive voice, omissions, recurring themes, and how their writing evolved.
Key figure profiles
AI-assisted biographical syntheses drawn from every entry that mentions each person or nation.
Jean Baptiste Charbonneau: The Infant Traveler of the Corps of Discovery
Born at Fort Mandan in February 1805, Sacagawea's son 'Pomp' became the youngest member of the Lewis and Clark Expedition, carried across…
The Shoshone Nation: Sacagawea’s People and the Key to the Mountains
Across 126 journal entries, the Shoshone (Snake) people emerge as the indispensable hinge of the expedition — the nation whose horses, geography,…
George Shannon: The Youngest Soldier of the Corps of Discovery
From a starving boy lost on the prairie to a trusted hunter and trader on the return journey, George Shannon's three-year apprenticeship…
John Colter: The Hunter Who Walked Away From Home
From Pryor's mess at Camp Dubois to a solitary parting on the upper Missouri, John Colter emerges in the journals as one…
The Chinook Nation: First Encounters at the Pacific
When the Corps of Discovery reached the mouth of the Columbia in November 1805, the Chinook were the first nation to greet…
The Shawnee Nation in the Lewis & Clark Record
Though the Corps of Discovery did not encounter the Shawnee homeland during their westward journey, the Shawnee people occupied a notable place…
Sergeant Nathaniel Pryor: A Steady Hand of the Corps of Discovery
From squad leader at Camp Dubois to trusted lieutenant of small parties, Sergeant Nathaniel Pryor emerges from the journals as one of…
The Pawnee Nation: A Distant Presence in the Expedition’s Record
Though the Corps of Discovery never held formal council with the Pawnee, the nation hovers at the edges of the journals as…
Sergeant Charles Floyd: The Only Casualty of the Corps of Discovery
Sergeant Charles Floyd, the youngest of the expedition's three sergeants, became the sole member of the Corps of Discovery to die during…
The Clatsop Nation: Hosts of the Corps’ Pacific Winter
For more than three months in the winter of 1805–1806, the Clatsop people of the lower Columbia were the nearest neighbors, traders,…
York: The Enslaved Man Who Crossed a Continent
Enslaved by William Clark from boyhood, York walked, paddled, hunted, voted, and traded across 8,000 miles with the Corps of Discovery —…
Silas Goodrich: The Expedition’s Fisherman
Private Silas Goodrich served as the Corps of Discovery's most dedicated angler, contracted syphilis at Fort Clatsop, and was among the small…
Browse by date
853 date-bound analyses, in chronological order.
How these analyses are written
AI-Assisted Each analysis is drafted by Anthropic Claude using only the primary-source journal entries cited within it, then reviewed by a human editor before publication. AI surfaces patterns that single-narrator scholarship cannot — copying lineages, prose-register shifts, side-by-side accounts of the same day from opposite sides of the camp. Every claim must trace to a specific journal entry. We're transparent about the method because we believe it's defensible scholarship, not a substitute for it.