Share of Long-Term Unauthorized Immigrants Surpasses Share of Short-Term ImmigrantsAs the unauthorized population has tilted more toward long-term residents, these immigrants are more likely to have children who are U.S. citizens because they were born in the U.S. Among unauthorized immigrants, the Pew Research Center estimates that in 2012, 4 million, or 38% of adults, lived with their U.S.-born children, either minors or adults. In 2000, 2.1 million, or 30% of unauthorized adults, did.3 About three-quarters of unauthorized parents residing with their U.S.-born children in 2012—3 million—had lived in the U.S. for 10 years or more.