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?
{'answer': 'World War II', 'supporting_facts': [['Midewin National Tallgrass Prairie', 0], ['Midewin National Tallgrass Prairie', 1], ['Joliet Army Ammunition Plant', 0], ['Joliet Army Ammunition Plant', 1]]}