The Lemhi Shoshone lived in the Salmon River country of present-day central Idaho, a resource-rich but geographically isolated region. They possessed many horses but few guns, making them vulnerable to raids by the better-armed Blackfeet and Hidatsa.

The band’s decision to trade horses to the expedition — influenced heavily by Sacagawea’s reunion with her brother Cameahwait — was one of the most consequential moments of the journey. Without Shoshone horses, the expedition could not have crossed the Rocky Mountains.

The Lemhi Shoshone were later removed from their ancestral lands and placed on the Fort Hall Reservation in southeastern Idaho in 1907 — a removal they have contested ever since.

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Clark visited the grave of the recently deceased Omaha chief Blackbird, who had ruled his people through intimidation and was said to have used arsenic obtained from traders to poison rivals. Blackbird had been buried sitting upright on his horse atop a bluff overlooking the Missouri — Clark paid his respects at this dramatic grave site.

The expedition noted the Omaha’s recent population losses from smallpox and expressed interest in future trade relations. The Omaha would later maintain a complicated relationship with American settlers and the U.S. government throughout the 19th century.

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The council set the template for dozens of similar meetings throughout the journey: Lewis delivered a speech about American sovereignty and trade, distributed gifts (medals, flags, trade goods), demonstrated the air rifle, and invited chiefs to visit the “Great Father” in Washington.

The Otoe and Missouria had been weakened by smallpox and warfare with other tribes. They were interested in the trade relationship the expedition promised but lacked the military power to resist or negotiate from strength.

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The Yankton were generally receptive to the expedition’s message of American sovereignty and trade. The council included traditional calumet ceremonies, speeches, and gift exchange. Pierre Dorion Sr., who had lived among the Yankton for decades, served as interpreter.

The positive encounter with the Yankton stood in contrast to the tense confrontation with the Teton Sioux just weeks later, illustrating the diverse responses of different Siouan peoples to the expedition.

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On the return journey in April 1806, the expedition stayed three days with the Walla Walla. Yelleppit organized a gathering of over 500 people, with dancing, trading, and cultural exchange. The chief gifted Clark a white horse, and the expedition provided in return a peace medal, a handkerchief, and other trade goods.

The Walla Walla later became part of the Confederated Tribes of the Umatilla Indian Reservation, established by the Treaty of 1855. Their positive relationship with the expedition stands as an example of what cross-cultural encounters could look like when both sides approached with goodwill.

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The Tillamook had already salvaged much of the whale by the time the expedition arrived. Clark traded for about 300 pounds of blubber and some whale oil — valuable provisions for the monotonous diet at Fort Clatsop. The expedition also noted the Tillamook’s skill in processing whale products and making canoes.

Sacagawea accompanied this coastal expedition after insisting on seeing both the ocean and the whale — one of the few times her personal wishes are recorded in the journals.

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The Arikara had been severely weakened by smallpox epidemics in the late 18th century, reducing their population from perhaps 30,000 to approximately 2,000. Despite this devastation, they maintained their agricultural villages and trade networks.

Relations between the expedition and the Arikara were cautiously friendly — the captains held councils, distributed gifts, and attempted to broker peace between the Arikara and the Mandan. One Arikara chief agreed to travel to Washington, D.C. but died during the journey.

In 1823, Arikara warriors attacked William Ashley’s fur trading party, killing or wounding many men in one of the most significant armed conflicts between Americans and Plains Indians. This attack was partly motivated by the death of the chief who had gone to Washington and by perceived broken promises from the American government.

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Despite their English name, the Salish did not practice head-flattening — the name was apparently applied by neighboring peoples. They were skilled horse people who ranged across the Northern Rockies, often in conflict with the Blackfeet.

The Salish oral tradition preserves their own account of the Lewis and Clark encounter, noting their wonder at the strangers’ appearance and possessions. The expedition members noted the Salish language’s unusual sounds, which they compared to speech impediments — in fact, the Salish language family has distinctive consonant clusters unfamiliar to English speakers.

The Flathead Reservation was established in western Montana in 1855. The Confederated Salish and Kootenai Tribes maintain a strong connection to the Lewis and Clark story through their oral traditions and ancestral lands along the expedition route.

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The Lakota saw the American expedition as a challenge to their trade monopoly on the Missouri. The three-day standoff — featuring warrior posturing, weapons drawn on both sides, and tense diplomacy — nearly erupted into violence that could have ended the expedition.

Clark’s characterization of the Teton Sioux as “the vilest miscreants of the savage race” reflected the captains’ frustration and fear during this encounter, though it ignored the legitimate economic and political interests driving Lakota behavior.

The Lakota would become the most formidable opponents of American westward expansion over the next 80 years, from Red Cloud’s War through the Battle of the Little Bighorn to the tragedy at Wounded Knee.

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When Clark’s advance party stumbled onto the Weippe Prairie half-starved after the Bitterroot crossing, a Nez Perce woman named Watkuweis — who had been treated kindly by Euro-Americans in her youth — reportedly urged her people not to harm the strangers. This intervention may have saved the expedition.

The Nez Perce provided food, helped build canoes, cared for the expedition’s horse herd for months, and furnished guides for the return Bitterroot crossing. The expedition spent more time with the Nez Perce than with any people except the Mandan — producing detailed ethnographic records of their culture.

The Nez Perce’s generosity was remembered when, 70 years later, Chief Joseph cited the Lewis and Clark friendship during the Nez Perce War of 1877. The broken promises that followed the expedition cast a long shadow over this initially hopeful relationship.

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