For the last two months of their life in the United States, José Alberto González and his family spent nearly all their time in their one-bedroom Denver apartment. They did not speak to anyone except their roommates, another family from Venezuela.

They consulted WhatsApp messages for warnings of immigration agents in the area before leaving for the rare landscaping job or to buy groceries.

But most days at 7:20 a.m., González’s wife took their children to school.

The appeal of their children learning English in American schools, and the desire to make money, had compelled González and his wife to bring their 6- and 3-year-old on the monthslong journey to the United States.

They arrived two years ago, planning to stay for a decade. But on Feb. 28, González and his family boarded a bus f

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