Yet the enthusiasm on display last week suggests that DACA may prove immensely popular.

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The DREAM Act would have conferred permanent-resident status on roughly the same set of immigrants that DACA covers.

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Ms. Beecher recalls standing-room only crowds at DACA workshops held by the organization last year, but said a recent event attracted fewer than 30.

WSJ: Young Immigrants' Applications to Stay in U.S. Fall Sharply

Though DACA is not a law, a regulation, or even a long-term solution, it is significant because of the opportunities it opens up to more than a million young people.

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La Universidad de Daca reconoce a la Sra.

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Some immigrants are holding off because Congress has begun to consider an immigration overhaul that could offer legal permanent status to most of the 11 million illegal immigrants in the U.S. The DACA program doesn't offer a green card or a path to citizenship, and participants must reapply every two years.

WSJ: Young Immigrants' Applications to Stay in U.S. Fall Sharply