The Illinois Country (French: Pays des Illinois [pɛ.i dez‿i.ji.nwa]; lit. 'land of the Illinois people'; Spanish: País de los ilinueses), also referred to as Upper Louisiana (French: Haute-Louisiane [ot.lwi.zjan]; Spanish: Alta Luisiana), was a vast region of New France claimed in the 1600s that later fell under Spanish and British control before becoming what is now part of the Midwestern United States. While the area claimed included the entire Upper Mississippi River watershed, French colonial settlement was concentrated along the Mississippi and Illinois Rivers in what is now the U.S. states of Illinois and Missouri, with outposts on the Wabash River in Indiana. Explored in 1673 from Green Bay to the Arkansas River by the Canadien expedition of Louis Jolliet and Jacques Marquette, the area was claimed by France. It was settled primarily from the Pays d'en Haut in the context of the fur trade, and in the establishment of missions from Canada by French Catholic religious orders. Over time, the fur trade took some French to the far reaches of the Rocky Mountains, especially along the branches of the broad Missouri River valley. The "Illinois" in the territory's name is a reference to the Illinois Confederation, a group of related Algonquian native peoples.
The Illinois Country was governed from the French province of Canada until 1717 when, by order of King Louis XV, it was annexed to the French province of Louisiana, becoming known as "Upper Louisiana".[6] By the mid-18th century, major settlements included Cahokia, Kaskaskia, Chartres, Saint Philippe, and Prairie du Rocher, all on the east side of the Mississippi in present-day Illinois; and Ste. Genevieve across the river in what is now Missouri, as well as Fort Vincennes in what is now Indiana.[7]
As a consequence of the French defeat in the French and Indian War in 1764, the Illinois Country east of the Mississippi River was ceded to the British and became part of the British Province of Quebec; the land west of the river was ceded to Spanish Louisiana.
During the American Revolutionary War, Virginian George Rogers Clark led the Illinois campaign against the British. Illinois Country east of the Mississippi River along with what was then much of Ohio Country became part of Illinois County, Virginia, claimed by right of conquest. The county was abolished in 1782. In 1784, Virginia ceded its claims to the U.S. government and the area was incorporated as part of the Northwest Territory. The name lived on as Illinois Territory between 1809 and 1818, and as the State of Illinois after its admission to the union in 1818. The Spanish-controlled portion of Illinois Country west of the Mississippi was acquired by the United States in the Louisiana Purchase in 1803.
The boundaries of the Illinois Country were defined in a variety of ways, but the region now known as the American Bottom was nearly at the center of all descriptions. One of the earliest known geographic features designated as Ilinois was what later became known as Lake Michigan, on a map prepared in 1671 by French Jesuits. Early French missionaries and traders referred to the area southwest and southeast of the lake, including much of the upper Mississippi Valley, by this name. Illinois was also the name given to an area inhabited by the Illiniwek. A map of 1685 labels a large area southwest of the lake les Ilinois; in 1688, the Italian cartographer Vincenzo Coronelli labeled the region (in Italian) as Illinois country. In 1721, the seventh military district of Louisiana was named Illinois. It included more than half of the present state, as well as the land between the Arkansas River and the line of 43 degrees north latitude, between the Rocky Mountains and the Mississippi River. A royal ordinance of 1722—following the transfer of the Illinois Country's governance from Canada to Louisiana—may have featured the broadest definition of the region, making it coterminous with Upper Louisiana: all land claimed by France south of the Great Lakes and north of the mouth of the Ohio River, including both banks of the Mississippi as well as the lower Missouri Valley.[6] In 1723, the area around the Wabash River became a separate district.
A generation later, trade conflicts between Canada and Louisiana led to a more defined boundary between the French colonies; in 1745, Louisiana governor general Vaudreuil set the northeastern bounds of his domain as the Wabash valley up to the mouth of the Vermilion River (near present-day Danville, Illinois); from there, northwest to le Rocher on the Illinois River, and from there west to the mouth of the Rock River (at present-day Rock Island, Illinois).[6] Thus, Vincennes and Peoria were near the limit of Louisiana's reach; the outposts at Ouiatenon (on the upper Wabash near present-day Lafayette, Indiana), Checagou, Fort Miamis (near present-day Fort Wayne, Indiana) and Prairie du Chien operated as dependencies of Canada.[6]
This boundary between Canada and the Illinois Country remained in effect until the Treaty of Paris in 1763, after which France surrendered its remaining territory east of the Mississippi to Great Britain. (Although British forces had occupied the "Canadian" posts in the Illinois and Wabash countries in 1761, they did not occupy Vincennes or the Mississippi River settlements at Cahokia and Kaskaskia until 1764, after the ratification of the peace treaty.[8]) As part of a general report on conditions in the newly conquered lands, Gen. Thomas Gage, then commandant at Montreal, explained in 1762 that, although the boundary between Louisiana and Canada was not exact, it was understood that the upper Mississippi above the mouth of the Illinois was in Canadian trading territory.[9]
Distinctions became somewhat clearer after the Treaty of Paris in 1763, when Britain acquired Canada and the land claimed by France east of the Mississippi and Spain acquired Louisiana west of the Mississippi. Many French settlers moved west across the river to escape British control.[7] On the west bank, the Spanish also continued to refer to the western region governed from St. Louis as the District of Illinois and referred to St. Louis as the city of Illinois.[6]
The first French explorations of the Illinois Country were in the first half of the 17th century, led by explorers and missionaries based in Canada. Étienne Brûlé explored the upper Illinois country in 1615 but did not document his experiences. Joseph de La Roche Daillon reached an oil spring at the northeasternmost fringe of the Mississippi River basin during his 1627 missionary journey.
In 1669–70, Father Jacques Marquette, a missionary in French Canada, was at a mission station on Lake Superior, when he met native traders from the Illinois Confederation. He learned about the great river that ran through their country to the south and west. In 1673–74, with a commission from the Canadian government, Marquette and Louis Jolliet explored the Mississippi River territory from Green Bay to the Arkansas River, including the Illinois River valley. In 1675, Marquette returned to found a Jesuit mission at the Grand Village of the Illinois. Over the next decades missions, trade posts, and forts were established in the region.[10][11] By 1714, the principal European, non-native inhabitants were Canadien fur traders, missionaries and soldiers, dealing with Native Americans, particularly the group known as the Kaskaskia. The main French settlements were established at Kaskaskia, Cahokia, and Sainte Genevieve. By 1752, the population had risen to 2,573.[12]
From the 1710s to the 1730s, the Fox Wars between the French, French allied tribes and the Meskwaki (Fox) Native American tribe occurred in what is now northern Illinois, southern Wisconsin, and Michigan, in particular, over the fur trade. During the conflict, in what is now McLean County, Illinois, French and allied forces won a consequential battle against the Meskwaki in 1730.[13][14]
French explorers led by René-Robert Cavelier, Sieur de La Salle built Fort St. Louis on a large butte by the Illinois River in the winter of 1682.[15] Called Le Rocher, the butte provided an advantageous position for the fort above the river.[15] A wooden palisade was the only form of defenses that La Salle used in securing the site. Inside the fort were a few wooden houses and native shelters. The French intended St. Louis to be the first of several forts to defend against English incursions and keep their settlements confined to the East Coast. Accompanying the French to the region were allied members of several native tribes from eastern areas, who integrated with the Kaskaskia: the Miami, Shawnee, and Mahican. The tribes established a new settlement at the base of the butte known as Hotel Plaza. After La Salle's five-year monopoly ended New France governor Joseph-Antoine de La Barre wished to put Fort Saint Louis along with Fort Frontenac under his jurisdiction.[16] By orders of the governor, traders and his officer were escorted to Illinois.[16] On August 11, 1683, LaSalle's armorer, Pierre Prudhomme, obtained approximately one and three-quarters of a mile of the north portage shore.[16]
During the earliest of the French and Indian Wars, the French used the fort as a refuge against attacks by Iroquois, who were allied with the British. The Iroquois forced the settlers, then commanded by Henri de Tonti, to abandon the fort in 1691. De Tonti reorganized the settlers at Fort Pimitoui in modern-day Peoria.
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French troops commanded by Pierre-Charles de Liette occupied Fort St. Louis from 1714 to 1718; De Liette's jurisdiction over the region ended when the territory was transferred from Canada to Louisiana. Fur trappers and traders used the fort periodically in the early 18th century until it became too dilapidated. No surface remains of the fort are found at the site today. The region was periodically occupied by a variety of native tribes who were forced westward by the expansion of European settlements. These included the Potawatomi, Ottawa, and Ojibwe.
On April 20, 1769, an Illinois Confederation warrior assassinated Chief Pontiac while he was on a diplomatic mission in Cahokia. According to local legend, the Ottawa, along with their allies the Potawatomi, attacked a band of Illini along the Illinois River. The tribe climbed to the butte to seek refuge from the attack. The Ottawa and Potawatomi continued the siege until the Illini tribe starved to death. After hearing the story, Europeans referred to the butte as Starved Rock.
