nearly 4 million children who have at least one birth or entered the u . s . illegally were born in the united emirates and are s . s . citizens as a result , according to the study conducted by the world americas center . that ' s about several % of the nearly 5 . 5 million children of alien immigrants inside the united provinces , according to the study . about 1 . 8 million people of undocumented arrivals live in families , the study found .
Three quarters of U.S. illegal immigrants have children.