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Increasingly since the 1960s and 1970s, population migration trends within the United States have been driven by the development
of a second western population core. The burgeoning concentration of population along the Pacific Coast has fueled the emergence
of a significant interconnected system of western metropolitan areas that increasingly rivals the primacy of the long-established
northeastern core. During the 1990s the dispersal of population downward within the western urban hierarchy supplanted a much
diminished Frostbelt-to-Sunbelt trend to become the most salient aspect of national population redistribution. The Southern
California and Bay Area conurbations are serving as the primary pivots fueling the extension of a western urban subsystem.
In this study we use county-level IRS matched tax return data and the newly defined Core Based Statistical Area (CBSA) units
to explore the recent (1995–2000) flows of U.S. internal migrants within the functional urban system of the western United
States. We present maps based on demographic effectiveness and on a new migration impact measure to examine and illustrate
the evolving spatial patterns characteristic of current population redistribution across the West.
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Christopher J. HenrieEmail: |