Final answer:
The tornadoes did not occur in any of the cities mentioned. The references provide information about race riots in Springfield and Chicago during the early 1900s.
Step-by-step explanation:
The series of tornadoes that killed 60 people in Illinois did not occur in any of the cities mentioned in the options: Chicago, Springfield, Peoria, or Rockford. The information provided in the references is about race riots in Springfield and Chicago during the early 1900s. The Springfield riot in 1908 and the Chicago Race Riot in 1919 were both significant events that led to the creation of the NAACP.