By GLENN GAMBOA

Michael R. Bloomberg has believed mayors have plenty to teach each other since he was mayor of New York City and supported the effort to share good municipal ideas through his nonprofit Bloomberg Philanthropies since he left office in 2013.

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However, as more nations get bogged down in what the media entrepreneur and philanthropist calls “ideological battles and finger-pointing,” Bloomberg says mayors can do even more. He is expanding his support for them internationally, with the Bloomberg LSE European City Leadership Initiative, a collaboration with the London School of Economics and Political Science and the Hertie School in Berlin. And other philanthropists are investing in building stronger municipal governments to strengthen urban communities.

“Mayo

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