The United States has long been seen as the “land of opportunity”, the home of the American Dream. With the largest national economy in the world, well-developed infrastructure and high educational and social mobility, it is not hard to see its appeal. It hosts almost 20% of the world’s migrants, and boasts a huge mix of races, cultures and traditions. Despite government policies clamping down on illegal immigration, it still accepts far more international migrants than anywhere in the world, and the trend looks set to continue.