Final answer:
Aurora, Rockford, Joliet, and Peoria are all cities located in the state of Illinois, each contributing uniquely to the state's cultural and economic landscape.
Step-by-step explanation:
The state that has Aurora, Rockford, Joliet, and Peoria is Illinois. These cities are all located within the state's borders and are known for various cultural and economic contributions to Illinois. For example, Aurora is known for its historic architecture and role as a regional manufacturing hub. Rockford is recognized for its contributions to the aerospace industry and has notable museums. Joliet is famous for its entertainment venues, including the Chicagoland Speedway. Lastly, Peoria is an important economic center for central Illinois and is home to many cultural institutions.