Lewis and Clark Expedition in the context of "St. Charles, Missouri"

Thomas Jefferson's tenure as the third president of the United States began on March 4, 1801, and ended on March 4, 1809. Jefferson assumed the office after defeating incumbent president John Adams in the 1800 presidential election. The election was a political realignment in which the Democratic-Republican Party swept the Federalist Party out of power, ushering in a generation of Jeffersonian Republican dominance in American politics. After serving two terms, Jefferson was succeeded by Secretary of State James Madison, also of the Democratic-Republican Party.

Jefferson took office determined to roll back the Federalist program of the 1790s. His administration reduced taxes, government spending, and the national debt, and repealed the Alien and Sedition Acts. In foreign affairs, the major developments were the acquisition of the gigantic Louisiana Purchase from France in 1803, an embargo against trade with both Great Britain and France, and worsening relations with Britain as the United States tried to remain neutral in the midst of the Napoleonic Wars that engulfed Europe. He established a military academy, used the Navy to protect merchant ships from Barbary pirates in North Africa, and developed a plan to protect U.S. ports from foreign invasion by the use of small gunboats (a plan that proved useless when war came in 1812). He also authorized the Lewis and Clark Expedition to explore the Louisiana Territory and the Pacific Northwest.

Montana (/mɒnˈtænə/ mon-TAN-ə) is a landlocked state in the Mountain West subregion of the Western United States. It is bordered by Idaho to the west, North Dakota to the east, South Dakota to the southeast, Wyoming to the south, and the Canadian provinces of Alberta, British Columbia, and Saskatchewan to the north. It is the fourth-largest state by area, but the eighth-least populous state and the third-least densely populated state. Its capital is Helena, while the most populous city is Billings. The western half of the state contains numerous mountain ranges, while the eastern half is characterized by western prairie terrain and badlands, with smaller mountain ranges found throughout the state.

Most of Montana first came under American sovereignty with the Louisiana Purchase from France in 1803 and was explored by the Lewis and Clark Expedition shortly thereafter. Fur trappers followed and were the main economic activity in the area until gold was discovered in 1852. The ensuing gold rush, along with the passage of the Homestead Acts in 1862, brought large numbers of American settlers to Montana. Rapid population growth and development culminated in statehood on November 8, 1889. Mining, particularly around Butte and Helena, would remain the state's main economic engine through the mid-20th century.

Oregon (/ˈɒrɪɡən, -ɡɒn/ ORR-ih-ghən, -⁠gon) is a state in the Pacific Northwest region of the United States. It is a part of the Western U.S., with the Columbia River delineating much of Oregon's northern boundary with Washington, while the Snake River delineates much of its eastern boundary with Idaho. The 42° north parallel delineates the southern boundary with California and Nevada. The western boundary is formed by the Pacific Ocean.

Oregon has been home to many indigenous nations for thousands of years. The first European traders, explorers, and settlers began exploring what is now Oregon's Pacific coast in the early to mid-16th century. As early as 1564, the Spanish began sending vessels northeast from the Philippines, riding the Kuroshio Current in a sweeping circular route across the northern part of the Pacific. In 1592, Juan de Fuca undertook detailed mapping and studies of ocean currents in the Pacific Northwest, including the Oregon coast as well as the strait now bearing his name. The Lewis and Clark Expedition traversed Oregon in the early 19th century, and the first permanent European settlements in Oregon were established soon afterward by trappers and fur traders. The United States received joint occupation rights to the region from the United Kingdom through the Treaty of 1818. The Oregon Treaty of 1846 formally brought Oregon under American sovereignty, and the Oregon Territory was created two years later. Oregon was admitted to the United States on February 14, 1859, becoming the 33rd state.

Wallowa County (/wəˈlaʊwə/) is the northeasternmost county in the U.S. state of Oregon. As of the 2020 census, the population was 7,391, making it Oregon's fifth-least populous county. Its county seat is Enterprise. According to Oregon Geographic Names, the origins of the county's name are uncertain, with the most likely explanation being it is derived from the Nez Perce term for a structure of stakes (a weir) used in fishing. An alternative explanation is that Wallowa is derived from a Nez Perce word for "winding water". The journals of Lewis and Clark Expedition record the name of the Wallowa River as Wil-le-wah.

Wallowa County is part of the eight-county definition of Eastern Oregon.

The Rocky Mountains, also known as the Rockies, are a major mountain range and the largest mountain system in North America. The Rocky Mountains stretch 3,000 mi (4,800 km) in a straight-line distance from the northernmost part of Western Canada, to New Mexico in the Southwestern United States. Depending on differing definitions between Canada and the U.S., its northern terminus is located either in northern British Columbia's Terminal Range south of the Liard River and east of the Trench, or in the northeastern foothills of the Brooks Range/British Mountains that face the Beaufort Sea coasts between the Canning River and the Firth River across the Alaska–Yukon border. Its southernmost point is near the Albuquerque metropolitan area, adjacent to the Rio Grande rift, and north of the Sandia–Manzano Mountain Range, also near Santa Fe, New Mexico. Being the easternmost portion of the North American Cordillera, the Rockies are distinct from the tectonically younger Cascade Range and Sierra Nevada, which both lie farther to its west.

The Rockies formed 55 million to 80 million years ago during the Laramide orogeny, in which a number of plates began sliding underneath the North American plate. The angle of subduction was shallow, resulting in a broad belt of mountains running down western North America. Since then, further tectonic activity and erosion by glaciers have sculpted the Rockies into dramatic peaks and valleys. At the end of the last ice age, humans began inhabiting the mountain range. After explorations of the range by Europeans, such as Sir Alexander Mackenzie, and Anglo-Americans, such as the Lewis and Clark Expedition, natural resources such as minerals and fur drove the initial economic exploitation of the mountains, although the range itself has never experienced a dense population.

A trade item is an item that is the subject of trade. It is a term used primarily by people in supply chain management and logistic engineering. An often used term in the Journals of the Lewis and Clark Expedition.

George Rogers Clark (November 19, 1752 – February 13, 1818) was an American military officer and surveyor from Virginia who became the highest-ranking Patriot military officer on the northwestern frontier during the Revolutionary War. He served as leader of the Virginia militia in Kentucky (then part of Virginia) throughout much of the war. He is best known for his captures of Kaskaskia in 1778 and Vincennes in 1779 during the Illinois campaign, which greatly weakened British influence in the Northwest Territory (then part of the British Province of Quebec) and earned Clark the nickname of "Conqueror of the Old Northwest". The British ceded the entire Northwest Territory to the United States in the 1783 Treaty of Paris.

Clark's major military achievements occurred before his thirtieth birthday. Afterward, he led militia forces in the opening engagements of the Northwest Indian War, but was accused of being drunk on duty. He was disgraced and forced to resign, despite his demand for a formal investigation into the accusations. Clark left Kentucky to live in the Indiana Territory but was never fully reimbursed by the Virginian government for his wartime expenditures. During the final decades of his life, he worked to evade creditors and suffered living in increasing poverty and obscurity. He was involved in two failed attempts to open the Spanish-controlled Mississippi River to American traffic. Following a stroke and the amputation of his right leg, he became disabled. Clark was aided in his final years by family members, including his younger brother William, one of the leaders of the Lewis and Clark Expedition. He died of a stroke on February 13, 1818.

Zebulon Montgomery Pike (January 5, 1779 – April 27, 1813) was an American brigadier general and explorer for whom Pikes Peak in Colorado is named. As a U.S. Army officer he led two expeditions through the Louisiana Purchase territory, first in 1805–1806 to reconnoiter the upper northern reaches of the Mississippi River, and then in 1806–1807 to explore the southwest to the fringes of the northern Spanish-colonial settlements of New Mexico and Texas. Pike's expeditions coincided with other Jeffersonian expeditions, including the Lewis and Clark Expedition and the Red River Expedition in 1806.

Pike's second expedition crossed the Rocky Mountains into what is now southern Colorado, which resulted in his capture by the Spanish colonial authorities near Santa Fe, who then sent Pike and his men to Chihuahua (present-day Mexico) for interrogation. Later in 1807, Pike and some of his men were escorted by the Spanish through Texas and released near U.S. territory in early Louisiana.