Immigration affects the United States in many ways.
Second, instead of the US being a country of whites, it is also a country of Latinos. There is now a mixed ratial group present. Third, new customs and ideas are carried with them which could be passed on by, for example, just anybody joining them in the way of their culture, or through marriage. If they are married to someone who is not of their culture or religion, the family might take to that culture or religion, therefore spreading their ideas to others. Fourth, with so many people in the US already looking for jobs, such as the poor in the cities and elsewhere, this increasing population is going to make it harder for people to find jobs.