Which war prompted the U.S. military to first establish permanent commissary stores with fixed pricing to improve the retail experience for soldiers?

Military commissaries have a fascinating history in retail customer experience, evolving from basic ration distribution points to modern shopping facilities serving military personnel and their families. These retail operations have uniquely blended military precision with civilian retail practices, creating a distinct shopping experience for those who serve. This poll tests your knowledge about how military retail operations have evolved through major conflicts.

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American Civil War (1861-1865)
Spanish-American War (1898)
World War I (1914-1918)
Mexican-American War (1846-1848)