By 1888, the race to power America's cities had become a battle between the rival visions of Thomas Edison and Nikola Tesla. But when the powerful industrialist George Westinghouse threw his weight behind Tesla and his AC system, what had been a personal falling out became something far larger – a war over the future of electricity itself. Their bitter fight spilled into courtrooms, ignited a national debate about capital punishment, and culminated in a fierce competition for the contract to illuminate the most ambitious event of the decade: the Chicago World’s Fair.

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