What decisive event on November 16, 1896, effectively ended the 'War of the Currents' in favor of AC?

Answer

Buffalo, New York, being lit by AC generated miles away at Niagara Falls

The successful lighting of Buffalo, New York, using alternating current generated at Niagara Falls on November 16, 1896, marked the victory of the AC standard.

What decisive event on November 16, 1896, effectively ended the 'War of the Currents' in favor of AC?
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