The story of migration since then is the story of modern China, as migrant workers have transformed China's economy.
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It built a special Songkran fountain to lure visitors to Bangkok, which is traditionally deserted for the festival as migrant workers return to the countryside to visit relatives.
The World Bank says that rural wages (outside farms) fell by almost a fifth between 2007 and 2009 as migrant workers fled to their villages in search of jobs.
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As migrant workers pulled out of Spain or Ireland, the number of EU citizens living in Germany, Austria or Finland, but born elsewhere, went up marginally but not enough to compensate for the overall decline.
The new head of a body which licenses gangmasters hopes his experience as a police officer will help him to protect migrant workers.
Activists from the women's rights group Feminist Fightback have also joined the demonstration as a majority of the cleaners are women and migrant workers.
Texans Ruben , Daniel and David Perez , the sons of migrant farm workers, worked in the fields as children.
This is partly because many of these job losses have been in industries such as toymaking, textiles and construction, which use migrant and unskilled workers.
Similarly the depression of the 1890s provoked a host of migrant-hostile legislation in Argentina, America and elsewhere, as native-born workers demanded that foreign rivals be kept out.
Migrant workers would like to keep their limited rights to education, health and pensions as they move around the country.
In the past year, however, the provinces that usually absorb migrant farmers have become increasingly unable to do so, as the precipitous drop in orders for textiles and manufactured goods forces more and more factories that employ low-skilled migrant workers to shut down.
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