"Migration is a worldwide phenomenon that responds basically to the necessities of the international labor market and to other factors of socio-political and economic nature.... In ancient times...humanity registered considerable migratory flows, whether because of war, hunger, religion, illness or other factors. The demographic projections for underdeveloped countries indicate that their population will increase for the next century due mainly [to] two reasons: the mortality rate has been reduced in those countries thanks to technological development of the medical services; and [increasing birth rates]." (EXCERPT)

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