Illinois Important Dates

  • 1699 French priests founded a mission at Cahokia, the oldest permanent white settlement in Illinois. Kaskaskia was founded by the French in 1703.
  • 1763 France ceded the Illinois country to Great Britain after the French and Indian War.
  • 1778 Illinois became a county of Virginia after Americans captured Kaskaskia, the British seat of government. Virginia relinquished its claim in 1784.
  • 1787 Congress made Illinois part of the Northwest Territory. The Northwest Territory was divided in 1800, when Illinois became a part of Indiana Territory.
  • 1809 The Illinois Territory was formed when the Indiana Territory was divided.
  • 1818 Illinois became a state, after the Wisconsin region was transferred to the Michigan Territory.
  • 1832 The last serious Indian threat to white settlement ended when Sauk and Fox warriors were driven from the state during the Black Hawk War.
  • 1838 - 1856 Improvements in transportation hastened immigration to the northern counties. The National Road reached Vandalia in 1838. The Illinois-Michigan Canal opened in 1848. The Illinois Central Railroad was completed in 1856.
  • 1839 - 1846 Mormons from Missouri and Ohio built the city of Nauvoo before their westward exodus.
  • 1861 - 1865 About 250,000 Illinois men served in the Union armed forces during the Civil War.
  • 1871 Fire destroyed much of Chicago and its public records.



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