On the persistence of U.S. migration rates in the 20th century

The persistence or inertia of net migration rates in the United States during the twentieth century is measured. A set of basic migration data for states, counties, and state economic areas is described, and manipulations of these data are discussed. "The manipulated data are [then] analyzed graphically and by regression. The report concludes with a few remarks on the use of demographic extrapolations for planning and policy purposes."