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.

In 1803, President Thomas Jefferson issued the following instructions to Meriwether Lewis: " The object of your mission is to explore the Missouri river, & such principal stream of it, as, by its course & communication with the waters of the Pacific Ocean, whether the Columbia, Oregon, Colorado and / or other river may offer the most direct & practicable water communication across this continent, for the purposes of commerce.

In a famous letter to Meriwether Lewis in 1803, Thomas Jefferson instructed the Lewis and Clark expedition to " carry with you some matter of the kine-pox ; inform those of them with whom you may be, of its efficacy as a preservative from the smallpox ; & encourage them in the use of it ..." Jefferson had developed an interest in protecting Native Americans from smallpox having been aware of epidemics along the Missouri River during the previous century.

Meriwether Lewis passed the Guyandotte and Big Sandy River peninsula on or about September 20, 1803 on his way down the Ohio River before meeting up with William Clark in Clarksville, Indiana.

After the purchase of the Louisiana Territory in 1803, President Thomas Jefferson commissioned Meriwether Lewis and William Clark to lead an expedition to explore the western territories.

Along with Meriwether Lewis, Clark led the Lewis and Clark Expedition of 1803 to 1806 across the Louisiana Purchase to the Pacific Ocean, and claimed the Pacific Northwest for the United States.

In 1803, Thomas Jefferson sent Meriwether Lewis to Philadelphia to prepare for the Lewis and Clark Expedition under the tutelage of Rush, who taught Lewis about frontier illnesses and the performance of bloodletting.

In 1803, President Thomas Jefferson commissioned the Corps of Discovery, and named his personal secretary and U. S. Army Captain, Meriwether Lewis, its leader, who selected William Clark as his partner.

In 1803, with the successful purchase of the Louisiana Territory from France, President Thomas Jefferson ordered an expedition to the west coast, which was led by Captain Meriwether Lewis and William Clark.

A request, dated January 13, 1812, by William Clark ( famous for his exploration of the American West with Meriwether Lewis and the Corps of Discovery from 1803 to 1805 ), then the governor of the Louisiana Territory ( the territory was renamed the Missouri Territory soon after the quake to eliminate confusion with the new state of Louisiana ), asked for federal relief for the " inhabitants of New Madrid County.

The United States acquired the Missouri River watershed through the Louisiana Purchase of 1803, and President Thomas Jefferson sent Meriwether Lewis and William Clark with a company of men to explore up the Missouri in the hopes of finding a navigable water route to the Pacific, with a low portage connecting one watershed with the other.

The outdoor skills he had developed from this frontier lifestyle impressed Meriwether Lewis, and on October 15, 1803, Lewis offered Colter the rank of private and a pay of five dollars a month.

After the purchase of the Louisiana Territory in 1803, President Thomas Jefferson commissioned Meriwether Lewis and William Clark to lead an expedition to explore the western territories.

In 1803, Meriwether Lewis and William Clark organized their expedition across North America at the Falls of the Ohio and Louisville.

Also in 1803, Jefferson engaged Ellicott as a mentor and teacher for Meriwether Lewis, one of the leaders of the Lewis and Clark Expedition that was to start the following year.

* 1803 – Lewis and Clark start their expedition to the west by leaving Pittsburgh, Pennsylvania at 11 in the morning.

* 1803 – Francis Lewis, signer of the American Declaration of Independence ( b. 1713 )

* 1713 – Francis Lewis, American signer of the Declaration of Independence ( d. 1803 )

Elected president in what Jefferson called the Revolution of 1800, he oversaw the purchase of the vast Louisiana Territory from France ( 1803 ), and sent the Lewis and Clark Expedition ( 1804 – 1806 ) to explore the new west.

* March 21 – Francis Lewis, American signer of the Declaration of Independence ( d. 1803 )

According to his letter from Fredericktown, Ohio on April 15, 1803, Lewis purchased the soup from Francois Baillet, a cook in Philadelphia.

Croghan was adopted in 1841, Denmark was in 1807, Diana in 1830, Greig 1828, Harrisburg 1803, Highmarket 1852, Lewis 1852, Leyden 1797, Lowville 1800, Martinsburg 1803, Montague 1850, New Bremen 1848, Osceola 1844, Pinckney 1808, Turin 1800, Watson 1821, and West Turin in 1830.

Explorers William Clark and his slave York were members of the Lewis and Clark Expedition ( 1803 – 1805 ), and William's older brother, General George Rogers Clark -- conqueror of the old Northwest Territory and Revolutionary War hero.

In 1803, Lewis and Clark passed nearby and recruited West Point citizen John Shields to join their Corps of Discovery.

When the area was acquired by the United States through the Louisiana Purchase in 1803, the Lewis and Clark Expedition came through Creve Coeur.

In 1803, part of the town was used to establish part of the Town of Harrisburg ( now in Lewis County ).

It was named after Lewis Cass after it was founded in 1803.

They arose in a natural geographic and economic expansion driven by the lucrative earnings available in the North American fur trade, in the wake of the various 1806 – 07 published accounts of the Lewis and Clark expeditions ' ( 1803 – 1806 ) findings about the Rockies and the ( ownership-disputed ) Oregon Country where they flourished economically for over three decades.

Lewis and Clark, appointed by Thomas Jefferson, named the Dearborn River in west-central Montana after Dearborn in 1803.

Thomas Jefferson sent the Lewis and Clark expedition into the Pacific Northwest in 1803, and envisioned the establishment of an independent nation in the western portion of North America which he dubbed the " Republic of the Pacific ", hence the association of his name with regional autonomy.

He was probably recruited in 1803 by William Clark at Fort Kaskasia, Illinois while serving in the 1st U. S. Infantry.

He joined the Corps of Discovery in August 1803, as one of the three men ( and Seaman ) from Pittsburgh recruited by Lewis as he was waiting for the completion of the voyage's vessels in the city.

Windsor was recruited at Kaskaskia in 1803, joining the party as a Private at Camp Dubois, January 1, 1804.

William Clark arrived at Camp Dubois first with a group of men that he recruited from Kaskaskia and Fort Massac on December 12, 1803.

The Lewis and Clark expedition carried an even shorter version, 33-36 inches, similar to the Harpers Ferry Model 1803 which began production six months after Lewis paid the arsenal a visit.

* Ian D Clark ( 1995 ), Scars in the landscape: A register of massacre sites in western Victoria, 1803 – 1859, Australian Institute of Aboriginal and Torres Strait Islander Studies ( Canberra ), ISBN 0-85575-281-5

In 1803, the two halves were united under the name of canton of Aargau, which was then admitted as a full member of the reconstituted Confederation.

They held the first Burns supper on what they thought was his birthday on 29 January 1802, but in 1803 discovered from the Ayr parish records that the correct date was 25 January 1759, and since then suppers have been held on 25 January, Burns ' birthday.

Alphonsus Maria de Liguori ( d. 1787 ), founder of the Congregation of the Most Holy Redeemer, then brought some attention back to casuistry by publishing again Hermann Busembaum's Medulla Theologiae Moralis ; the last edition published in 1785 and receiving the approbation of the Holy See in 1803.

Monroe was then appointed Minister to the Court of St. James ( Britain ) from 1803 to 1807.

First, its left bank territories were occupied, and then annexed, by France starting in 1795 ; then, in 1803, its right bank territories were taken by the Margrave of Baden.

Ercole died in 1803 and Breisgau passed to his daughter and her husband, who then ( 1806 ) lost it during the Napoleonic reorganization of the western territories of the defunct Holy Roman Empire to the enlarged and elevated Grand Duchy of Baden.

Control of Osnabrück passed to the Electorate of Hanover in 1803 during the German Mediatisation and then briefly to the Kingdom of Prussia in 1806.

Spain was forced by the Third Treaty of San Ildefonso in 1800 to return its Louisiana Territory ( of which modern Jackson County then formed a part ) to France, which in turn sold it to the United States in the Louisiana Purchase of 1803.

Meanwhile, ownership of the region shifted in quick succession from Spain to France and then in 1803 to the United States via the Louisiana Purchase.

On January 14, 1803, the Governor of Indiana Territory, William Henry Harrison, issued a similar proclamation defining the boundaries as beginning at a point where an east and west line passing through the southernmost extreme of Lake Michigan would intersect a north and south line, passing through the westernmost extreme of the lake, then north to the territorial boundary, then along said boundary line to a point where an east and west line passing through the southerly extreme of Lake Michigan would intersect the same, then along this last mentioned line to the place of beginning.

The area, inhabited first by the Adais ( Brushwood ) Indians of the Caddo Confederacy, was first under Spanish rule, then French, English, Spanish again, and French when Napoleon sold it to the United States in the Louisiana Purchase of 1803.

The region returned later to French control and then was part of the Louisiana Purchase in 1803 by the United States.

Church services were established in 1803 by Augustin Métoyer and have been held continuously since then.

Chartered as a town on March 12, 1803, Port Gibson is Mississippi's third-oldest European-American settlement, being occupied in 1729 by French colonists, as it was then within French-claimed territory, La Louisiane.

After the Revolution, the town was established from part of the Town of Livingston in 1803, but was then called the " Town of Gallatin.

Eventually, the land was conveyed to James McCubbin Lingan in 1785, then to Captain George Calmes in 1803.

John Peck had purchased land that had previously been sold under the 1795 act and later sold this land to Robert Fletcher who then brought this suit against Peck in 1803, claiming that he did not have clear title to the land when he sold it.

Palmerston was then at the University of Edinburgh ( 1800 – 1803 ), where he learnt political economy from Dugald Stewart, a friend of the Scottish philosophers Adam Ferguson and Adam Smith.

This squat had been the practice until 1803 in what was still almost purely Catholic Bavaria, but was then removed with the inclusion of Protestant areas.

In 1803 he became a student of philosophy and theology at the University of Helmstedt, where Heinrich Henke was his most influential teacher ; but the latter part of his university course was taken at the Göttingen, where Johann Gottfried Eichhorn and Thomas Christian Tychsen were then at the height of their popularity.

In the late 18th and early 19th centuries, land claimed by Spain encompassed a large part of the contemporary U. S. territory, including the French colony of Louisiana that was under Spanish control from 1763 to 1800, and then part of the United States since 1803.

The Duke of York, then Commander-in-Chief of the Forces, recalled him in May 1803 after receiving reports of the mutiny but despite this direct order he refused to return to England until his successor arrived.