Backbencher left-wing state Assemblyman Zohran Mamdani took political veteran Andrew Cuomo and Curtis Sliwa to school when he clinched a historic victory in New York City’s mayoral race.

Political analysts told The Post that the young democratic socialist sustained his meteoric rise by focusing relentlessly on the high cost of living in the city — even as critics panned his tax hikes and spending proposals as impractical to address it.

His message won.

In the end, voters decided the charismatic 34-year-old lefty lawmaker was a fresh face who would bring about necessary change, as opposed to the former governor and the Guardian Angels founder — both in the public eye for 40 years.

“A new generation has taken over New York City,” said communications strategist Andrew Kirtzman.

“It

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