In the end, Penn State created plans for a commemoration, and the Flight 93 National Memorial, part of the National Park Service, set out several days of lectures and memorials that culminated Saturday in a solemn reading of the names of the victims, the placing of a wreath at the memorial wall listing those who perished, and speeches by former president George W. Bush and Vice President Kamala Harris. Shelves of books have been written about how the Civil War lives in American memory, scholarly articles have been published about World War I in French memory, and movies and books by the score have sought to ensure that the Nazi genocide of the Jews in World War II is never lost to world memory.