previous experience of refuge crisis shows that migrants can eventually become valuable contributors to the economic and social development of countries other german cities like munich diisseldorf stuttgart and freiburg have established welcome departments within their city halls to prepare for the arrival of refugees over the past two decades urban population growth and the effects of globalization have enhanced the complexities and manifestation of crime and violence in cities one study showed that to per cent of urban residents have been victims of crime in those developing or transitional countries where rapid urban population growth is at its highest