On Tuesday, the longtime secretary of the Smithsonian Institution announced his retirement at the end of the year. The move follows repeated clashes with the Trump administration over the direction of the institution, which encompasses numerous museums, research centers, libraries, and the National Zoo. Lonnie G. Bunch III is the fourteenth secretary in 173 years of the institution, but also the first Black man and first historian to serve as head of the Smithsonian.

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