Changes at the Smithsonian, a longstanding American institution, have both staffers and historians concerned, according to new reports. Here’s a timeline of what has been going on.

In a letter addressed to Lonnie G. Bunch III, the Secretary of the Smithsonian, White House officials said they would lead a “comprehensive internal review” of Smithsonian museums and exhibitions, focusing on areas including public-facing content, the curatorial process, and exhibition planning, among others.

Donald Trump's administration is conducting a review of the Smithsonian Institution, starting with the Museum of African American History and others.