The article explores how immigrants impact the US economy, where they choose to live, and how their wages change over time. It shows that undocumented immigrants earn less but find jobs more easily than documented immigrants. Undocumented immigration creates more jobs for native workers, while documented immigration can lead to fewer jobs for natives. Stricter immigration enforcement can increase unemployment for all workers. Immigrants tend to live in big, expensive cities and earn less than native workers there. They also send some of their money back to their home countries.