PARIS—Faiza Farah remembers the thrill of uprooting her life in Oakland, Calif., to move to the City of Love to marry a Frenchman.

“It was like living a dream,” the 37-year-old American says.

Today, Ms. Farah is holed up with her husband and their 11-month-old son in a 400-square-foot apartment, after President Emmanuel Macron ordered a national…

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