Hundreds of thousands of young immigrants living in the United States illegally have willingly come out of the shadows and identified themselves to the Obama administration on the promise that they would be safe from deportation and allowed to work.
Some may now regret that decision as President-elect Donald Trump has promised to immediately scrap the programme that protected them.
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If he does, it is not clear whether he would take action against the more than 741,000 participants of the amnesty programme. But if he decides to pursue them, the government now has their addresses, photographs and fingerprints.
Nancy Villas, 20, was among the first to apply for the Deferred Action for Childhood Arrivals programme in the summer of 2012, waiting in line for hours at a sign-up site at Chicago's Navy Pier.
Since then she has been working part time at a child-care centre to pay for college classes. Now she is worried that she may eventually be forced to return to Mexico, a country she left when she was nine years old.
"I knew it was the only way to have better opportunities," Villas said. "I took the risk without thinking that somebody would want to take it away."
Potential deportations under Trump
Trump made illegal immigration the cornerstone of his campaign, promising to build a massive wall along the Mexican border and deport millions of people living in the country illegally.
Once he takes office, Trump can almost immediately rescind the promised protection and can probably make the accompanying work permits void.
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But there is little to suggest that he would move swiftly to deport participants in the programme. In a post-election interview with CBS' 60 Minutes, Trump said that he would focus initially on criminal immigrants living illegally in the US. He said that could be about