- Difficult to measure at the national level only if they contain census data on immigrants and their places of origin and the dates they come to places dimension.
- More factors affecting economic factors to migrate attractive and parcels, as well as demographic factors is the high population growth rates, and the increasing human pressure on resources.
- Migration from rural to urban areas is one of the most important aspects of internal migration.
- Migration to the cities (urbanization) most important characteristic of developing countries because of its economic development and industrialization, and that includes factors such as the expulsion in the countryside: Increasing population pressure on agricultural land, low standard of living.
- Includes urban attraction such as: the presence of job factors, availability of multiple services.
- Means of transportation and contribute to a private railway in finding immigration currents along their length.
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