This year marks the 200-year anniversary of Illinois. Check out some milestone moments in the state's history:

1973: The Sears Tower – the world’s tallest building – is completed in downtown Chicago. The building is now known as the Willis Tower.
This year marks the 200-year anniversary of Illinois. Check out some milestone moments in the state's history:

1973: The Sears Tower – the world’s tallest building – is completed in downtown Chicago. The building is now known as the Willis Tower.
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how and when eastern colony people moved to westward after lewis & clark expedition in 1804-06 from ILLINOIS