The undocumented population from Mexico, the principal source of immigrants to the United States, dropped to 4.4 million from 6.6 million during that period. The number of undocumented Polish immigrants shrank by half from 2010 to 2019 amid improving conditions in Poland. After facing risks and paying smugglers to cross the border, undocumented workers stayed in the United States, rather than coming and going. For Mr. and Ms. Hernandez, years in the United States turned into decades. “I will want to care for my grandchildren.”The post Many Undocumented Immigrants Are Departing After Decades in the U.S. appeared first on New York Times.