Self-Selection and Internal Migration in the United States, Volume 2

The population of the United States is highly mobile. Since the 1960s, approximately three percent of the population moves across state lines in any given year, and 10 percent of the population moves across state lines in a five-year period. In view of the falling fertility rates of American women, this extensive mobility implies that migration has become an increasingly important source of demographic change in the various regions and a major determinant of concurrent changes in regional economic growth.