New York City Mayor Zohran Mamdani delivers remarks after Sen. Bernie Sanders, I-Vt., swears him in during public ceremony.

Democrat Zohran Mamdani has been sworn in as New York City’s mayor, kicking off his term during a public swearing-in ceremony and aiming to deliver on a liberal agenda and address cost-of-living conce...

Inauguration Day: Mr. Mamdani, the city’s first Muslim and South Asian mayor and its youngest in more than a century, was inaugurated in a public celebration outside City Hall.