31. Most of the modern-day population growth is based on internal migration within Poland and urbanization of surrounding areas. 32. On June 3, 1997 the Commission on Internal Migration was established to study the controversial loss of residential units. 33. Massive internal migration made both population counts and registering deaths problematic, and Cao's estimate takes internal migration into account. 34. This internal migration has helped moderate the hot economy's wage pressures, but it has caused problems of its own. 35. They are part of an unending internal migration to Guatemala's Peten region, which covers a third of the country. 36. Massive internal migration made both population counts and registering deaths problematic, and Cao's estimate takes internal migration into account. 37. By the 1950s, rapid urbanization and the associated internal migration meant that fewer children were enrolling in rural schools. 38. There are both economic and social imbalances among states in India and this leads to internal migration in general. 39. There was only a trickle of internal migrations before the operation, but the operation triggered a mass exodus of population. 40. The Netherlands and the the internal migration to Brussels and the industrial areas of Wallonia, which continued throughout the period.
