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John C. Frémont was the most celebrated explorer of his era. In 1842, on the first of five expeditions he would lead to the Far West, Frémont and a small party of men journeyed up the Kansas and Platte Rivers to the Wind River Range in Wyoming. At the time, virtually this entire region was known as the Great Desert, and many Americans viewed it and the Rocky Mountains beyond as natural barriers to the United States. After Congress published Frémont's official report of the expedition, however, few doubted the nation should expand to the Pacific.The first in-depth study of this remarkable report,Sight Unseenargues that Frémont used both a radical form of art and an imaginary map to create an aesthetic desire for expansion. He not only redefined the Great Desert as a novel and complex environment, but on a summit of the Wind River Range, he envisioned the Continental Divide as a feature that would unify rather than impede a larger nation.In addition to provoking the great migration to Oregon and providing an aesthetic justification for the National Park system, Frémont's report profoundly altered American views of geography, progress, and the need for a transcontinental railroad. By helping to shape the very notion of Manifest Destiny, the report became one of the most important documents in the history of American landscape.

When Sen. Thomas Hart Benton, one of Missouri's first two senators and the great-uncle of the famous regionalist painter of the same name, was expecting his second child in 1824, he hoped it would be a boy. Although he was graced instead with a second girl, he named her Jessie (in honor of his father, Jesse) and raised her more like a son than a nineteenth-century daughter, introducing her to the leading politicians of the day and making sure she received an education that emphasized history, literature, and languages. Jessie and her father were close; Senator Benton was the main influence in her life until 1841, when, at the age of seventeen, she married army explorer John Charles Frémont against her parents' wishes. Some degree of reconciliation occurred when Benton promoted Frémont's famous explorations of the Great West. Jessie remained in Missouri with the couple's young daughter, Lily, but she later helped to write and edit reports of her husband's adventures, and these narratives spread the lure of the West to nineteenth-century America. In 1849 Jessie and Lily made a harrowing and treacherous journey across the Isthmus of Panama to rendezvous with Frémont in San Francisco. With income from their gold mines, the Frémonts established a home in California. In 1856, with the country on the brink of civil war, Frémont's antislavery position was instrumental in his being chosen as the Republican Party's first presidential nominee. Jessie was a staunch campaigner for her husband's unsuccessful presidential bid, which her father, a lifelong Democrat, refused to endorse. When President Lincoln appointed Frémont as the commander of the Department of the West in 1861, Jessie served as his unofficial aide and closest adviser. In a particularly dramatic incident, she rushed to Washington, D.C., for a meeting with Lincoln in which she argued passionately for her husband's proposal to emancipate the slaves in Missouri. After the Civil War, the Frémonts' financial situation took a downturn. Undaunted, Jessie supported the family by writing about her adventures in the American West in such works as A Year of American Travel and Souvenirs of My Time. Like many women of her era, Jessie lived her ambitions largely through her husband's career, but she also made a name for herself as a writer and a firm opponent of slavery.