T o paraphrase the musical Rent, 131,487,300 minutes – how do you measure, measure 250 years? Especially in a country navigating an election year fraught with divisions and disagreements over basic facts? That is the challenge facing the Smithsonian National Museum of American History in Washington DC as it marks the semiquincentennial of US independence. Its answer is with 250 objects that tell the American story, ranging from a revolutionary war-era gunboat to gloves worn by a “Miracle on Ice” hockey player, from Thomas Jefferson’s desk to a Donald Trump fan’s “Make America great again” hat. “How do you structure a commemoration, celebration and time for reflection?” asks Anthea Hartig , the museum’s director. “What we landed on were those moments where individuals or communities had fought for recognition and advocated for their own sense of identity and self in their role in creating and becoming a part of the United States.…