  Finally, one of the most complex and controversial issues within the literature on the morality of immigration is what criteria a state may permissibly employ to distinguish among applicants for admission. Countries might use either a lottery or a first-come, first-admitted waitlist, but they might also screen the applicants and give preference to those whose language, culture and/or skill sets make them most likely to assimilate in the host state’s economy and political culture. But what if a country’s immigration policies differentiate among applicants on the basis of race, ethnicity, gender, religion or country of origin? What if a country flatly refused to even consider applications for immigration from Asians or Africans, for instance?