That describes internal migration rather than immigration (international migration). In the end the results may be similar, but it's a different thing. You can

That describes internal migration rather than immigration (international migration). In the end the results may be similar, but it's a different thing. You can't be deported out of China (though you can be sent back to your village) but they are generally speaking the same culture and people, for the majority of cases. Every large country which has transformed from agrarian to industrial has gone through this internal migration phase. From former USSR down to Bolivia or Mali.