Lewis and Clark Expedition - Preparations

Preparations

Jefferson had a long interest in western expansion, and in 1780s met John Ledyard who discussed a proposed trip to the Pacific Northwest. Jefferson had read Mackenzie's book about the trip in 1802, and this influenced his decision to send an expedition. Two years into his presidency, he asked Congress to fund an expedition through the Louisiana Purchase, and to the Pacific Ocean. He used a secret message to ask for funding due to poor relations with the opposition party in Congress.

In 1803, President Thomas Jefferson commissioned the Corps of Discovery, and named U.S. Army Captain Meriwether Lewis its leader, who selected William Clark as his partner. Their goals were to explore the Louisiana Purchase, establish trade and U.S. sovereignty over the native peoples along the River Missouri. Jefferson also wanted to establish a U.S. claim of "Discovery" to the Pacific Northwest and Oregon territory by documenting an American presence there before Europeans could claim the land. According to some historians, Jefferson understood he would have a better claim of ownership to the Pacific Northwest if the team gathered scientific data on animals and plants.

The U.S. mint prepared special silver medals with a portrait of Jefferson and had a message of friendship and peace, called Indian Peace Medals or peace medals. The soldiers were to distribute them to the nations they met. These symbolized U.S. sovereignty over the indigenous inhabitants. The expedition also prepared advanced weapons to display their military firepower. Among these was an air rifle of about .44 caliber, powerful enough to kill a deer.

The expedition was prepared with sufficient black powder and lead for their flintlock firearms, knives, blacksmithing supplies, and cartography equipment. They also carried flags, gift bundles, medicine and other items they would need for their journey. Much time went into ensuring a sufficient supply of these items.

The route of Lewis and Clark's expedition, up the Missouri River to its headwaters, then on to the Pacific via the Columbia River, may have been influenced by the purported transcontinental journey of Moncacht-Apé by the same route about a century before. Jefferson had a copy of Le Page's book detailing Moncacht-Apé's itinerary in his library, and Lewis carried a copy with him during the expedition. Le Page's description of Moncacht-Apé's route across the continent, which neglects to mention the need to cross the Rocky Mountains, may be the source of Lewis and Clark's mistaken belief that they could easily carry boats from the Missouri's headwaters to the westward-flowing Columbia.

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