Beginning in the late 1970s and early 1980s, the steel industry in Pittsburgh began to implode along with the deindustrialization of the U.S. Following the 1981–1982 recession, for example, the mills laid off 153,000 workers. The steel mills began to shut down. These closures caused a ripple effect, as railroads, mines, and other factories across the region lost business and closed. The local economy suffered a depression, marked by high unemployment and underemployment, as laid-off workers took lower-paying, non-union jobs. Pittsburgh suffered as elsewhere in the Rust Belt with a declining population, and like many other U.S. cities, it also saw white flight to the suburbs.