John Logan Allen - Lewis & Clark Research Database https://lewisandclarkresearch.org/contributor/john-logan-allen/ A digital archive of treaties, documents, artwork, and 360° trail panoramas from the Corps of Discovery Wed, 11 Feb 2026 01:27:42 +0000 en-US hourly 1 Lewis and Clark and the Route to the Pacific https://lewisandclarkresearch.org/research-articles/lewis-and-clark-and-the-route-to-the-pacific/ Wed, 11 Feb 2026 01:27:42 +0000 https://research.lewisandclarktrust.org/research-articles/lewis-and-clark-and-the-route-to-the-pacific/ A foundational study of the geographical imagination that shaped the Lewis and Clark Expedition, examining how pre-expedition assumptions about western geography influenced the journey's planning and execution.

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]]> Allen provides a seminal analysis of the geographic knowledge and misconceptions that shaped the Lewis and Clark Expedition from conception through execution. The article traces the evolution of European and American understanding of trans-Mississippi geography, focusing on the persistent myth of a short, easy portage between navigable tributaries of the Missouri and Columbia Rivers. Allen demonstrates how this “passage through the garden” concept, rooted in Renaissance-era geographic theory and reinforced by speculative 18th-century cartography, fundamentally shaped Jefferson’s instructions and Lewis’s expectations. The article examines how the expedition’s actual discoveries — the vast, mountainous barrier of the Rockies, the absence of an easy water route, the complexity of the Columbia River system — systematically dismantled these optimistic assumptions. Allen argues that understanding this “geography of the imagination” is essential for interpreting the expedition’s decisions, frustrations, and ultimate achievement in crossing a continent far more formidable than anyone had anticipated.

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]]> Lewis and Clark: The Maps of Exploration, 1507-1814 https://lewisandclarkresearch.org/research-articles/lewis-and-clark-the-maps-of-exploration-1507-1814/ Wed, 11 Feb 2026 01:27:40 +0000 https://research.lewisandclarktrust.org/research-articles/lewis-and-clark-the-maps-of-exploration-1507-1814/ A comprehensive survey of the cartographic history of western North America as it relates to the Lewis and Clark Expedition, from early European maps through Clark's master map.

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]]> Allen provides a sweeping survey of the cartographic knowledge and misconceptions that shaped the Lewis and Clark Expedition’s understanding of western geography. The article traces the evolution of European and American maps of the continent from the early 16th century, highlighting how persistent geographic myths — including the imagined “height of land” where major rivers originated in close proximity — influenced Jefferson’s instructions and Lewis’s expectations. Allen examines the specific maps Lewis and Clark carried, including those produced by the Mackay-Evans expedition, Aaron Arrowsmith, and Nicholas King, and how these maps both aided and misled the explorers. The article culminates with an analysis of William Clark’s magnificent 1810 master map, which synthesized the expedition’s observations with information from Native peoples to produce the most accurate map of western North America yet created.

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