They grew up in America and are working or going to school here. Some are building businesses or raising families of their own. Many have no memory of the country where they were born.
Now, almost 800,000 young immigrants who were brought to the U.S. illegally as children or overstayed their visas could see their lives upended after the Trump administration announced Tuesday it is ending the Obama-era program that protected them from deportation.
"We are Americans in heart, mind and soul. We just don't have the correct documentation that states we're American," said Jose Rivas, 27, who is studying for a master's in counseling at the University of Wyoming.
Rivas' grandmother brought him to this country from Mexico when he was 6. He wants to become a school counselor in America but lamented: "Everything is up in the air at this point."
The news that the government is phasing out the Deferred Action for Childhood Arrivals program, known as DACA , was met with shock, anger and a sense of betrayal by its beneficiaries, often called "Dreamers."
Demonstrations broke out in New York City, where police handcuffed and removed over a dozen immigration activists who briefly blocked Trump Tower, and in other cities, including Salt Lake City, Denver, Los Angeles and Portland, Oregon. Students walked out of class in protest in several cities, including Phoenix and Albuquerque.
Attorney General Jeff Sessions said DACA, started by President Barack Obama in 2012, was an unconstitutional exercise of executive power. The Trump administration and other DACA opponents argue that it is up to Congress to decide how to deal with such immigrants.
Late Tuesday night, Trump tweeted, however, that he might get involved in the issue if Congress does not come up with legislation. The president tweeted: "Congress now has 6 months to legalize DACA (something the Obama Administration was unable to do). If they can't, I will revisit this issue!"
Attorneys general for several states threatened to sue to protect the DACA beneficiaries. "We stand ready to take all appropriate legal action to protect Oregon's Dreamers," Oregon Attorney General Ellen Rosenblum tweeted.
Utah Attorney General Sean Reyes, a Republican and an early Trump supporter, said the president has every right to end DACA. But he added that it would be unconscionable to deport those who benefited from the program.
"These children grew up believing they are American, and so many of them have lived lives of which America can be proud," Reyes said.
At a Los Angeles rally, handyman John Willis carried a sign saying "American lives matter" and criticized the DACA program as an "unlawful tyrannical executive order that our previous president thrust upon us."
"I don't wish these kids to be sent back to Mexico or anything like that. But I don't believe we should have two sets of laws," he said. "We have one set of laws, we should follow them. Congress needs to get up off the pot and enact some legislation to take care of this mess."
Trump's action received harsh reviews among those in Houston who have been helping immigrants navigate disaster relief amid fears of ramped-up deportations in the new administration. The city is home to more than a half-million immigrants in the country illegally, and one DACA recipient described at a news conference how her family lost everything in the storm.
Another Houston DACA beneficiary, Ricardo Ortiz, who was brought to the U.S. from Monterrey, Mexico, at age 3, has been volunteering at the downtown convention center that sheltered thousands of storm victims.
"It's crazy that people really think that we don't belong here when we've been here all of our lives," said Ortiz, a 21-year-old student at the University of Houston.
In Miami, Paola Martinez, 23, who is from Bogota, Colombia, sobbed as she attended a rally of about 100 immigrants. She said she will feel helpless without DACA. She recently graduated with a civil engineering degree from Florida International University.
"Instead of going a step forward, we are going a step backwards. We are hiding in the shadows again after my work (permit) expires. It's just sadness," she said. "You just feel like you are empty. There is no support anymore."
Martinez said she is not able to renew her permit because it expires in 2019, so she is hoping her employer or another company sponsors her so she can stay and help support her parents, who depend on her for rides and household expenses. In Florida, immigrants who are illegally in the country cannot get driver's licenses.
Karen Marin, a 26-year-old from New York whose parents brought her to the U.S. from Mexico before she was a year old, was in physics class at Bronx Community College when Sessions made the announcement.
"I honestly I can't even process it right now. I'm still trying to get myself together," Marin said. "I just hope that they do change their mind and they realize what they're doing is wrong."
Carla Chavarria, 24, is a Phoenix entrepreneur who owns a digital marketing firm and a fitness apparel line. She came to the U.S. from Mexico when she was 7.
Her permit expires in November, and she is waiting for her renewal to be processed. She is set to close on the purchase of a home later this month.
"It's hard being a business owner as it is, especially with being young and being a woman and someone who's an immigrant. It's already hard as it is. Now having DACA being taken away," she said.
"I'm sort of like in limbo right now."
Selsky reported from Woodburn, Oregon, and Hoffner reported from Phoenix. AP reporters Adriana Gomez Licon in Miami; Nomaan Merchant in Houston; Michelle Price in Salt Lake City; Amanda Myers in Los Angeles and Astrid Galvan in Phoenix contributed to this report.
Follow Andrew Selsky on Twitter at https://twitter.com/andrewselsky
This version corrects that DACA applicants must be at least 15 to apply for the program and that young children are not eligible.