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The global inconsistency in electrical outlets, voltages, and frequencies is more than a travel inconvenience. It’s the product of over a century of technical decisions, industrial momentum, political fragmentation, and localized optimization. This article explores how and why countries diverged in electrical infrastructure, and what this means for product development, energy systems, and international engineering efforts in 2025 and beyond. Origins: Competing Visions of Electricity DistributionAt the turn...