Immigrants in! Minutemen out!

America do not have room for bigotry, ignorance and racism.
While it is widely held that a given ethnic group may assimilate to its host culture over a period of time, rhetoric espoused by the host culture rarely takes into account the difficulties for the individuals involved. In fact, the question may be asked "is it possible for an individual to assimilate at all, and if so, till what age is it impossible?"