As the US gears up for a major anniversary, a new expansive exhibition looks at history in a range of objects, from an 18th-century gunboat to a Maga hat As the US gears up for a major anniversary, a new expansive exhibition looks at history in a range of objects, from an 18th-century gunboat to a Maga hat 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