Illinois is a state located in the Midwestern region of the United States. It is the fifth most populous state in the country and has a diverse economy that includes industries such as agriculture, manufacturing, finance, and transportation. The state is known for its vibrant cities, including Chicago, which is one of the largest cities in the country and a major center for culture, commerce, and education. Illinois is also home to numerous universities and colleges, including the University of Illinois, Northwestern University, and the University of Chicago. Other notable attractions in Illinois include the Lincoln Presidential Library and Museum, the Willis Tower (formerly known as the Sears Tower), and the Abraham Lincoln Presidential Library and Museum. The state is bordered by Wisconsin to the north, Indiana to the east, Kentucky to the south, and Missouri and Iowa to the west.