Catalina Rodriguez-Lima runs a city office whose mission is to attract new immigrants to Baltimore, a strategy for reversing decades of population decline. Adrian Florido hide caption

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Adrian Florido

New York City Mayor Bill de Blasio speaks after being sworn in during the public inauguration ceremony at City Hall in New York on Jan. 1. Seth Wenig/AP hide caption

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Seth Wenig/AP

Sadia Bies and Boston Mayor Thomas Menino stand next to her portrait of him at a July press conference. Menino, the city's longest-serving mayor, is stepping down at the end of his term. Aynsley Floyd/Invision for Gillette hide caption

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Aynsley Floyd/Invision for Gillette