Distilled Demographics: Migration

Migration is a minefield for demographers; varying definitions and meaurements can be difficult to sort out. Migration is the geographic movement of people across a ­boundaries to establish a new ­permanent or semipermanent residence. Along with fertility and mortality, migration is a component of population change. How is an "immigrant" defined? Why do people migrate? How is the world becoming a "melting pot?" In this video, PRB senior demographer Carl Haub answers these questions and clarifies how migration affects population.

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