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American Expansion: 1780 - 1855

  1. American Settlements
  2. Progress in the new State
  3. The Emergence of Abraham Lincoln

American Settlements

Most of the early American settlements in Illinois were in the southern part of the state along the Mississippi and Ohio River valleys. The French influence was still felt in the northern part of the territory. Jean Baptiste Du Sable, a black Haitian trader, established a trading post at the mouth of the Chicago River in 1779. In 1784, Virginia gave up its claim on Illinois to the United States government. The Northwest Territory, which included Illinois, was established on July 13, 1787. General Arthur St. Clair was appointed governor of the Northwest Territory. He created the first county in Illinois in 1790 and named it St. Clair County. Cahokia served as the seat of the new county's government. Illinois became part of the Indiana Territory in 1800.

The Americans built Fort Dearborn near Lake Michigan in 1803, at the site of present day Chicago. In 1809, the Illinois Territory was created, consisting of present day Illinois and Wisconsin. Kaskaskia became the first territorial capital. The first territorial governor was Ninian Edwards.


Conflicts arose between Indians living in Illinois and the newly formed United States during this period. The Sauk and Mesquakie Indians fought against the Americans during the Revolutionary War. The Americans destroyed the Indian village of Saukenuk, near present day Rock Island, in 1780. 

In 1804, several chiefs of the Sauk and Mesquakie tribes signed a treaty giving their land in Illinois to the United States. Many of the Sauks refused to recognize this treaty as legal. Led by the warrior Black Hawk, they sided with the British in the War of 1812. They defeated the Americans in battles at Campbell's Island and Credit Island along the Mississippi River.

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This statue of the Indian warrior Black Hawk is at the Black Hawk Historic Site in Rock Island.


White settlers were also overrunning the Potawatomi Indian land during this period. Consequently, the Potawatomi attacked Fort Dearborn in August 1812 and killed a number of women, children and soldiers. In October 1812, the Potawatomi Indian villages around Peoria were destroyed by United States troops led by Ninian Edwards. The next year, the French citizens of Peoria were deported to an area near Alton. Fort Clark was built at Peoria in 1813 to protect the incoming settlers. The Potawatomis attacked and destroyed Fort Clark in 1819. Skirmishes between the Potawatomi Indians and the United States continued for the next few years.


As the white population in Illinois increased, the settlers began a campaign for statehood. The first constitution of Illinois was adopted at Kaskaskia on August 26, 1818. Illinois became the 21st state on December 3, 1818. Shadrach Bond was elected the first Governor and Pierre Menard the first Lieutenant Governor. Kaskaskia was the first state capital. The capital was moved to Vandalia in 1820. After statehood, the white population of Illinois grew rapidly. There were more than 150,000 white residents by 1830.

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The home of Pierre Menard near Kaskaskia was known as the "Mount Vernon of the West".

Because of the increase in the white population, Indians living in Illinois were forced to abandon the land they had lived on for centuries. The Sauk and Mesquakie Indians in northern Illinois moved west of the Mississippi River into Iowa. In 1832, Black Hawk and his followers returned to Illinois to reclaim their land. After several fierce battles, Black Hawk was chased into southern Wisconsin and defeated at the Battle of Bad Axe on August 2, 1832. Black Hawk and his sons were eventually captured. The end of this war was the last Indian uprising in Illinois.

As the United States presence expanded in North America, treaties were signed with many of the Indian tribes who lived on the land. These treaties professed to protect Indian land while allowing white settlement. However, violations of these treaties occurred frequently. Eventually, the United States decided to relocate all of the Indian tribes living east of the Mississippi River. The Indian Removal Act of 1830 forced these tribes to move to Indian territory in Kansas or Oklahoma. The Peoria, Kaskaskia, Sauk, Fox, Chippewa and Potawatomi were sent to Kansas. 

The move caused great hardship for the emigrant tribes. Many Indians died on the trip. Once they arrived, they found land that was very different from their original lands and had a difficult time surviving. The Cherokee Indians of the southeastern United States traveled through southern Illinois to Oklahoma on what became known as the "Trail of Tears" because of the number of deaths which occurred along the way.

Additional Resources

bulletTo learn more about this time period, see the Illinois State Museum's At Home on the Prairie.
bulletFind out more about the early history of Fort Dearborn and Chicago.
bulletLearn more about the effects of immigration on Native Americans.

Study Guide Questions

  1. Why were the first American settlements mainly in the southern part of Illinois?
  2. Who established a trading post at the site of present day Chicago in the early 1800's?
  3. What was the first county in Illinois and what city was the county seat?
  4. Who was Ninian Edwards?
  5. When did Illinois become a state and who was the first Governor?
  6. Who was Black Hawk and how did he and his followers react to Illinois becoming part of the United States?
  7. What effect did United States westward expansion have on the Indians living in Illinois?

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