A crisis that has led federal immigration authorities to bus nearly 2,000 unaccompanied children (so far) from shelters around the country to a “tent city” in the desert town of Tornillo, Tex. Children stuck in immigration limbo for longer, have strained the system that manages such kids.  According to the New York Times, officials feared that the children being taken to Texas — among 13,000 being detained nationwide — would run off if they were told ahead of time, or moved them during waking hours.