French explorers Louis Jolliet and Father Marquette arrived in Illinois in 1673, and it became part of French Louisiana in 1717. At the end of the French and Indian war, Illinois came under England’s rule. In 1809, Illinois became a territory and attained statehood in 1818 as the 21st state. In 1865, Illinois became the first state to ratify the 13th Amendment to the Constitution abolishing slavery. Known as the Land of Lincoln and home to the Abraham Lincoln Presidential Library, the state is also the birthplace of Ronald Reagan.
This information was drawn from the Illinois.gov website, where you will find more detail on Illinois facts and history.
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