For some 20 years after 1948, Preston became home to a significant number of Asian and Caribbean Commonwealth immigrants, who mostly worked in the manufacturing industry. However, an economic decline hit the town once again in the 1970s, capped by the closure of the Courtaulds factory in 1979 (nearly 3,000 job losses) and the decline of the docks on the River Ribble, which finally closed in 1981. Mass unemployment was firmly back in Preston by the early 1980s, although it was now very much a national crisis due to the recession of that time.