Which war saw the establishment of the first modern military commissary system that used fixed pricing strategies instead of market-based pricing to ensure affordability for soldiers?

Military commissaries have been essential to troop morale and logistics for centuries, providing soldiers with affordable goods while deployed. These retail operations have evolved dramatically from simple sutlers following armies to sophisticated global supply chains. This trivia question explores the origins of modern military retail operations and their historical significance in supporting armed forces.

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American Civil War (1861-1865)
World War I (1914-1918)
Napoleonic Wars (1803-1815)
Spanish-American War (1898)