Eva Emery Dye

Eva Emery Dye as depicted in a collage of eminent Oregon women, in the 1928 book Women of the West

Dye then began researching the Lewis and Clark Expedition, which had reached the Pacific Northwest in 1805. Her subsequent book The Conquest was loosely a joint biography of William Clark and his brother George Rogers Clark (who did not accompany the expedition), yet it was soon lauded for its vivid portrayal of a personage who had played only a minor role in earlier narratives.

Reliable historical information about Sacagawea is extremely limited; even the correct spelling of her name (Lewis and Clark rendered it eight different ways) and the date of her death are under dispute. As the Oregon History Project observes:

The Expedition journals make note of her service as an interpreter and mention that she pointed out familiar landmarks when they entered Shoshone territory. There is little evidence to suggest, however, that she acted as the Expedition’s guide beyond recognizing Bozeman Pass as a good place to cross the Continental Divide.[6]

While her previous book included fictional stylistic elements but conformed on a narrative level to known facts, The Conquest was notably unfettered by adherence to the historical record. Dye's portrayal of Sacagawea ascribed to her imagined features (no portrait or description survives), and postulated that her role was integral to the expedition's success, to the extent that she should be commemorated equally with Lewis and Clark:

Sacajawea's hair was neatly braided, her nose was fine and straight, and her skin pure copper like a statue in some Florentine gallery. Madonna of her race, she had led the way to a new time. To the hands of this girl, not yet eighteen, had been entrusted the key that unlocked the road to Asia...Some day, upon the Bozeman Pass, Sacajawea's statue will stand beside that of Clark. Some day where the rivers part, her laurels will view with those of Lewis. Across North America a Shoshone Indian princess touched hands with Jefferson, opening her country.[7]

The book became an immediate popular success. As Dye herself recalled:

The world snatched at my heroine, Sacajawea...The beauty of that faithful Indian woman with her baby on her back, leading those stalwart mountaineers and explorers through the strange land appealed to the world.[8]

Sacajawea statue in Washington Park pointing the way westward

The book's popularity also brought political ramifications. As Dye noted in her book, Sacagawea had been given a vote in a key decision of the expedition: whether or not to build Fort Clatsop and spend the winter on the Pacific coast. This led to "the Madonna of her race" being championed as a symbol of the burgeoning women's suffrage movement, which Dye enthusiastically supported. In keeping with her book's suggestion of a memorial to Sacagawea, a Statue Association was founded in Portland, Oregon, with Dye serving as its president. In this capacity she issued appeals to women's groups across the country, and coordinated the fundraising sale of commemorative "Sacajawea spoons" and "Sacajawea buttons."

In 1905 The National American Woman's Suffrage Association, convening in Portland, unveiled a statue, Sacajawea and Jean-Baptiste, by sculptor Alice Cooper of Denver. In her opening address, Susan B. Anthony remarked:

This is the first time in history that a statue has been erected in memory of a woman who accomplished patriotic deeds... This recognition of the assistance rendered by a woman in the discovery of this great section of the country is but the beginning of what is due...[9]

Following the ceremony, Dye formally presented the statue to the soon-to-open Lewis and Clark Centennial Exposition, where it was seen by an estimated three million visitors. It currently resides in Portland's Washington Park at 45.521469°N 122.70227°W / 45.521469; -122.70227 (Sacajawea statue in Washington Park).