Which military conflict prompted the U.S. Army to formally establish the Post Exchange (PX) system that revolutionized retail services for troops?

The Post Exchange (PX) system has been a crucial part of military life for generations, providing retail services to service members and their families on bases worldwide. This retail system has evolved dramatically since its origins in the 19th century, becoming one of the most unique retail operations in the world. Test your knowledge about this important aspect of military retail history that has shaped the lives of millions of service members.

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• The Spanish-American War (1898)
• World War I (1914-1918)
• The Philippine-American War (1899-1902)
• The Mexican-American War (1846-1848)

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