The following graphics, from the New York Times, summarize the labor market changes nationally since 1980. They make very clear why Michigan and the Detroit Metropolitan area have had such a hard time, given this area’s concentration in two categories–skilled production workers and machine operators and assemblers. Both of these categories have declined precipitously, both in absolute and relative terms. The accompanying article is a useful explanation of the national trends.
NYT: Middle-class occupations have shifted