Citizenship determines who is in and who is out, who has a voice in a democracy and who doesn’t. But for the one million young people who have grown up in the United States undocumented, feeling like they really belong here remains a dream deferred. This time, we hear from two of them living in limbo. Plus, legal scholar Amanda Frost unearths the unsettling stories of Americans who have had their citizenship taken away — because of their politics, their race, even because of whom they choose to marry.