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Zohran Mamdani, who will become New York City's youngest mayor since 1892, said in his victory speech that his win was a 'mandate for change'.

Zohran Mamdani, who will become New York City's youngest mayor since 1892, said in his victory speech that his win was a 'mandate for change'.

Watch: Key moments from election night in 90 seconds
Zohran Mamdani, who will become New York City's youngest mayor since 1892, said in his victory speech that his win was a 'mandate for change'.