More than a hundred years ago, African American veterans of The Civil War proposed a museum on the National Mall. A century later, the National Museum of African American History and Culture will open its doors with nearly 40,000 objects that will help us explore the country’s complicated past, from Emmett Till’s coffin to a pair of slave shackles; from Carl Lewis’ Olympic medals to Michael Jackson’s fedora. It comes as the sun sets on the second term of the country’s first black president—and at a time when racial tensions are flaring. The museum’s challenging task ahead: to celebrate black history and culture without glossing over a painful legacy of slavery and oppression, or the racism of today; to say to Americans of all races: This is your story, too.