Opposition to immigration exists in most nation-states with immigration, and has become a significant political issue in many countries. Immigration in the modern sense refers to movement of people from one nation-state or territory to another nation-state or territory where they are not citizens. It is important to distinguish between legal and illegal immigration in considering opposition to immigration. Illegal immigration is immigration in contravention of a nation's immigration laws.The principal concerns expressed by those opposed to immigration are the perceived effects economic costs (job competition and burdens on education and social services); negative environmental impact from accelerated population growth; increased crime rates, threats of infectious diseases and, in the long