Which conflict led to the formal establishment of the modern PX (Post Exchange) system that revolutionized how military personnel accessed retail goods during deployment?

Military exchanges (Post Exchange/Base Exchange) have been a cornerstone of military life for generations, providing essential goods and services to service members and their families worldwide. These unique retail operations have evolved dramatically throughout military history, adapting to changing warfare conditions and technological advancements. This poll tests your knowledge about one of the most significant retail innovations in military history.

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• The American Civil War (1861-1865)
• The Spanish-American War (1898)
• World War I (1914-1918)
• The Philippine-American War (1899-1902)

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