HAMTRAMCK, Mich. — ...last year, a Muslim who emigrated from Yemen as a teenager became mayor — the city’s first leader in nearly a century with no Polish roots — alongside what is believed to be the nation’s only all-Muslim city council. Many residents in this tiny enclave just north of downtown Detroit saw these changes as a sign of the Hamtramck’s progressiveness. The Muslim community that had previously experienced discrimination, including voter intimidation and resistance to mosques’ public call to prayer, had finally taken its seats at the table. Yet the ethnic, cultural and religious diversity that made Hamtramck...