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Illinois was above sea level for at least part of the Mesozoic, but by its end was again submerged by the Western Interior Seaway. This receded by the Eocene Epoch. During the Pleistocene Epoch, vast ice sheets covered much of Illinois, with only the Driftless Area remaining exposed.
The administrative divisions of Illinois are the counties, townships, precincts, cities, towns, villages, and special-purpose districts. [11] Illinois has more units of local government than any other state—over 8,000 in all. The basic subdivision of Illinois are the 102 counties. [12] 85 of the 102 counties are in turn divided into 1,432 ...
Illinois – fifth most populous of the 50 states of the United States of America. Illinois lies between Lake Michigan and the Mississippi River and the Ohio River in the Midwestern United States. Chicago, Illinois, is the third most populous city and the third most populous metropolitan area of the United States.
Of the fifty U.S. states, Illinois has the fifth-largest gross domestic product (GDP), the sixth-largest population, and the 25th-most land area. Its capital city is Springfield in the center of the state, and the state's largest city is Chicago in the northeast. Present-day Illinois was inhabited by Indigenous cultures for
The Illinois side includes Henry County, Mercer County, and Rock Island County. [4] In extreme northwestern Illinois the Driftless Zone, a region of unglaciated and therefore higher and more rugged topography, occupies a small part of the state. Charles Mound, located in this region, is the state's highest elevation above sea level.
The history of Illinois may be defined by several broad historical periods, namely, the pre-Columbian period, the era of European exploration and colonization, its development as part of the American frontier, its early statehood period, growth in the 19th and 20th centuries, and contemporary Illinois of today.
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Dairy products and wheat are important secondary crops in specific segments of the state. In addition, some Illinois farmers grow specialty crops such as popcorn and pumpkins. The state is the largest producer of pumpkins among the U.S. states. [13] There is a large watermelon growing area centered on Lincoln, Illinois. Illinois wine is a ...