Which war saw the first official establishment of Post Exchanges (PX) for U.S. troops, revolutionizing how soldiers accessed consumer goods during deployment?

Throughout military history, soldiers' access to goods and supplies has been crucial for morale. The modern military retail system has evolved dramatically from ancient armies' basic supply chains to today's sophisticated Post Exchanges (PX) and Base Exchanges (BX). This poll tests your knowledge about the development of military retail operations and how they've shaped military culture and readiness throughout history.

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