Which geographic feature was most instrumental in transforming global retail supply chains after the standardization of shipping containers in the 1960s?

Supply chain management is a critical aspect of retail operations worldwide. Geographic factors like location, infrastructure, and natural resources significantly impact how products move from manufacturers to consumers. This trivia question tests your knowledge about a fascinating geographic aspect of global supply chains that revolutionized retail logistics in the 20th century.

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Deep-water natural harbors capable of accommodating container ships
Railroad networks connecting coastal cities to inland distribution centers
Mountain passes that allowed for new overland shipping routes
River systems that enabled cost-effective transport to landlocked regions