When a government starts deciding which stories museums can tell, it is not protecting history. It is rewriting it. When the Trump White House announced its plans to “review” the Smithsonian (which includes 21 museums, research centers, an arboretum and a zoo), that statement, to some, may have sounded bureaucratic or even harmless. It is neither. When governments police museums, they are not simply policing exhibitions. They are policing imagination itself. When governments police museums, they are not simply policing exhibitions. They are policing imagination itself. Philippe de Montebello, an art curator who previously directed the Metropolitan Museum of Art...