The documents discuss immigration trends in the US, particularly along the US-Mexico border. Several key points: 1) The US continues to attract the most immigrants worldwide, despite globalization and outsourcing. The US-Mexico border spans 2000 miles and sees over 250 million border crossings annually. 2) While European immigration dominated in the early 20th century, most modern immigrants come from Latin America and Asia, particularly Mexico. Immigrants tend to settle near the southwest border or in major coastal cities. 3) There are estimated to be over 11 million undocumented immigrants in the US, over half from Mexico, many traveling solo for work. Undocumented immigrants cluster near the southwest border. 4