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We asked Sigal Samuel, The Atlantic’s global religion editor, if there was one big story on her beat these days. Her answer was unequivocal: Yes, and it’s in China. In today’s Masthead Weekly, Sigal sums up the latest on the mass detention of Muslims in western China. And read through for details on how you can participate in the next installment of the Masthead Book Club.  — Matt Peterson

What to Know: China’s About-Face on Xinjiang

By Sigal Samuel

What we’re watching: China’s decision to put an estimated 1 million Muslims in internment camps is this year’s biggest religion story. In terms of numbers of people affected, it’s arguably one of the year’s biggest stories, period. “It is the largest internment of civilians in the world today,” U.S. Ambassador to the United Nations Nikki Haley said this month. “It may be the largest since World War II.”

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