What is Human migration?
:''For the general concept of species moving around, see [[migration]]. For people moving data around see [[data migration]]''. [[File:Eighteen year-old mother from Oklahoma now a California migrant - NARA - 195857.tiff|thumb|18-year-old mother from Oklahoma, who migrated to California, with her child. Photo from 1937.]] [[File:Partition of Punjab, India 1947.jpg|thumb|Crowded train with migrants, during the [[Partition of India]], in 1947.]] [[File:Bundesarchiv Bild 102-08662, Kiel, Deutsch-russische Flüchtlinge.jpg|thumb|Gemran-Russian migrant family, with all their possessions, in [[Kiel]], waiting to move to Canada. Photo from 1929.]] '''Human migration''' is people moving from one place to another. Migration can be within countries or between countries, and it often involves large groups of people. Humans are known to have migrated extensively throughout history and [[prehistory]]. Sometimes, the movement is voluntary, but sometimes, people are forced to move. They may suffer [[warfare]], religious and political [[persecution]], [[famine]], and other natural disasters. When people are forced to move, they are [[refugee]]s. Many refugees are [[illegal immigrant]]s and more than half are children and women. They may live in extreme poverty, lacking food, shelter, clothing, education and medical care. ==Urbanisation(rural to urban migration)== '''Rural-urban migration''', or [[urbanization|urbanisation]], is the movement from country areas to towns and cities. There are many reasons for people leaving the countryside. Often, they are [[overpopulation]], high birth rates, and starvation. [[Mechanization]] has caused a reduction in jobs available in the countryside. Farming is hard work, with long hours and little pay. Many are [[subsistence farming|subsistence]] farmers. In developing countries, a lack of money means a lack of machinery. Natural disasters, such as droughts, hurricanes, floods and volcanic eruptions, destroy villages and crops. There is a lack of services like schools and hospitals in the co