Features legal information about U.S. immigration law, U.S. Citizenship, obtaining a Green Card, and applying for the appropriate Visa for family, business, work (H-1B), and students. The U.S. immigration system is one of the most complex in the world. While we try to keep the information on our site current, the U.S. immigration rules often change and can nonetheless be interpreted differently by the various government bodies. A seemingly simple question or concern can often turn into a complex matter requiring the assistance of an immigration attorney.