Bangladesh, July 26 -- Zohran Mamdanis victory in New York Citys mayoral race has ignited passionate debate across the political spectrum. To his supporters, he represents the emergence of a new generation of progressive leadership capable of reshaping urban politics. To many conservatives, however, his rise symbolizes something much larger than the election of one mayor. The real issue, they argue, is not Mamdani himself but what his political success reveals about Americas immigration system and the nations changing electorate.

Some Republican leaders have portrayed Mamdani as a rising national political force. Comparisons to former President Barack Obama and predictions of future campaigns for Congress, the Senate, or even the White H...