Which geographic feature has most significantly transformed global retail supply chain routing in the past decade?

The geography of global supply chains is a critical factor in product development and delivery. Modern retailers must navigate complex networks spanning multiple continents, each with unique challenges and advantages. This poll tests your knowledge about how geography impacts supply chain decisions and logistics in the retail world. Can you identify the correct geographic insight that shapes how products move from concept to consumer?

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The expansion of the Panama Canal, completed in 2016, allowing ships with triple the previous capacity
The construction of the Gotthard Base Tunnel in Switzerland, creating a faster north-south European shipping corridor
The development of the Northern Sea Route above Russia, reducing shipping time between Europe and Asia
The completion of Africa's Trans-Saharan Highway, connecting Mediterranean ports to Sub-Saharan markets