Question: For which war was the ammunition plant, located in Illinois, and now a tallgrass prairie reserve; the largest conservation site in the Chicago Wilderness region, originally opened?
Sentence (from "Chicago Wilderness"): Through these activities, Chicago Wilderness played a major role in protecting and replenishing the naturally occurring ecosystems in the Chicago area as well as motivating people to become more aware and involved in the preservation of these lands and waters.
Relevant evidence: No