But their departure is no triumph. When Izgil calls his mother after arriving in the United States, the police in China confiscate her cellphone and ID card, returning them only after Izgil’s father and brother sign an affidavit promising never to speak to Izgil again. His friends delete his contact info on WeChat. Despite these precautions, some of his relatives are swept up in the mass detentions that have ensnared more than one million Uyghurs. Izgil cannot enjoy the uneasy freedom of life in the United States. With little English,…