The first thing you notice when you enter the American Dream Experience, a new exhibition at the Milken Center for Advancing the American Dream at 15th Street and Pennsylvania Avenue, Northwest, is a large golden “Tree of Generations” whose “leaves” are digital photos of visitors. Those will update frequently as attendees, whom the center will begin to welcome when it opens on Saturday, use booths nearby to talk about their families’ stories. Inside the galleries, you can chat with holograms of Serena Williams and Sanjay Gupta about their takes on the American Dream in English, Spanish, French, or Mandarin, among other languages. (In fact, the People’s House, which includes a replica of the White House, opened last year on the other side of Pennsylvania Avenue from the Milken Center, and officials there recently told me it had a quarter-million visitors in its first year.) Goslins said that when she discussed the vitality of the American Dream over the past year with people, she heard a lot of pessimism—until she asked about their families’ stories of how they ended up in the US, what made their story an American one.