Walla Walla people

The first encounter with Euro-Americans for the Walla Wallas was the Lewis and Clark Expedition. The first meeting in 1805, the Americans promised to Walla Walla chief Yellepit they would visit with the people after seeing the Pacific Ocean. The party returned in April 1806 and stayed at Yellepit's village, located on the Columbia River near the mouth of the Walla Walla River.[5] During a transaction Yellepit presented Clark with a white horse in return for a copper kettle. The Americans had none in supply, however, so Clark gave Yellepit his own sword, along with a quantity of gunpowder and musket balls.[6] Lewis and Clark also gave Yellepit a peace medal engraved with a portrait of President Thomas Jefferson, to be worn around the neck, and a small United States flag. Yellepit, Washington was later named after him.

David Thompson of the Canadian-British North West Company (NWC) was the next European in the Walla Walla lands, arriving in 1811. About five miles upriver from Yellepit's village on the confluence of the Snake River and the Columbia, Thompson ordered a pole be placed. An attached letter to the pole claimed the territory for the British Crown and stated the NWC intended to build a trading post at the site. Thompson's pole and letter were intended for the traders of the Pacific Fur Company, an American rival of the NWC. Continuing downriver, Thompson stopped at Yellepit's village and discovered the flag and medal left by the Americans. Thompson found Yellepit very friendly and intelligent, even encouraging Thompson's plan to set up a nearby trading post.[7] For various reasons the post was not built until 1818, when the NWC established Fort Nez Perces at the mouth of the Walla Walla River. During the summer of 1811, Thompson met also the Walla Walla head chief, Tumatapum, and his equal-ranking Quillquills Tuckapesten, Nimipu head chief, Ollicott, Cayuse head chief, and, probably, Kepowhan, Palus head chief, and Illim-Spokanee, Spokane head chief.

The Walla Wallas eventually adopted maintaining cattle herds, going as far as New Helvetia in California during 1844 to secure additional livestock. An estimated 40 Walla Wallas, Nez Perce and Cayuse under Walla Walla chief Piupiumaksmaks went on the expedition south. En route the party gathered stray horses, not aware the strays were stolen. Negotiations at New Helvetia were held between one of Piupiumaksmaks' sons, Toayahnu, and an employee of Sutter. The two men entered a dispute, and Toayahnu was killed.[8] Despite fears of retribution among Sutter's staff by the Walla Wallas, Piupiumaksmaks returned with a small band of warriors and families in 1846 and declared peaceable intentions.[9] The returning party had members infectees of measles, which began to spread across the Columbia Plateau, decimating indigenous populations.[10] Smallpox and other diseases were also introduced into the area, increasing the Walla Wallas population decline. Despite this, the Walla Wallas then held extensive herds of horses, being the "principal wealth" of the tribe.[11]

The Walla Walla were one of the tribal nations at the Walla Walla Council (1855) (along with the Cayuse, Nez Perce, Umatilla, and Yakama), which signed the Treaty of Walla Walla.[12]