Question: Midewin National Tallgrass Prairie is located on the site of a former United States Army arsenal that opened during which war?
Sentence (from "Joliet Army Ammunition Plant"): Joliet Army Ammunition Plant (JOAAP, formerly known as the Joliet Arsenal) was a United States Army arsenal located in Will County, Illinois, near Elwood, Illinois, south of Joliet, Illinois.
Relevant evidence: No