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Maps   North America Political Boundries in 1803 French Explorations of the Louisiana Territory, 1672-1743 Spanish Explorations of the Louisiana Territory, 1720-1793 A 1735 Map Showing the Missouri River on a Straight Course West Nicolas de Finiels’ Map of Missouri River, 1798 Samuel Lewis’ Map of Northwestern North America, 1804 Arrowsmith’s 1802 Map of North America King’s 1803 Map of North America Mackenzie Route from Fort Chipewyan to the Pacific Ocean, 1793 Jonathan Carver’s Map of North America, 1778 Map of Louisiana by du Pratz, 1757 Thomson’s Map of the Big Bend, 1798	A 1735 Map Showing the Missouri River on a Straight Course West A 1735 Map Showing the Missouri River on a Straight Course West This 1735 map is an example of how early maps speculatively represented the western territories of North America. In this map the Missouri River is shown as a straight watercourse flowing into a large lake in the distant west. Just west of the lake the map shows a single ridge of mountains flanked by streams and a large river flowing toward the Pacific Ocean. Map courtesy of the Library of Congress.