Jean Danhong Chen - Migration is an extremely complex demographic phenomenon that
responds to various causes that are very difficult to determine, especially because
due to irregular migrations or disguised as tourist activities or
otherwise, quantitative data are difficult to obtain, especially in the
case of underdeveloped countries.
Jean Danhong Chen -They respond to the general concern of
human beings to always seek a better place and quality of life for him and his
family.
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