It is 100 feet (30 m) high, 951 feet (290 m) long, 836 feet (255 m) wide, and covers 13.8 acres (5.6 ha).), and been as much as 50 feet (15 m) high, making its peak 150 feet (46 m) above the level of the plaza.
Illinois was an important manufacturing center during both world wars.
New railroads carried immigrants to new homes, as well as being used to ship commodity crops to Eastern markets.
The state became a transportation hub for the nation.
The Illinois's name for themselves, as attested in all three of the French missionary-period dictionaries of Illinois, was Inoka, of unknown meaning and unrelated to the other terms.
American Indians of successive cultures lived along the waterways of the Illinois area for thousands of years before the arrival of Europeans.