The U.S.'s most dominant industries look a lot different than they did less than 25 years ago. From 1990 to 2013, the top industries by employment have changed from mostly manufacturing to mostly health-care and social-assistance jobs in the majority of states, according to a U.S. Bureau of Labor Statistics data analysis of its Quarterly Census of Employment and Wages. The states where retail jobs were most prevalent were located mostly in the West in 1990 and now reside predominantly in the Southeast.
According to the Labor Department, "The largest increase in healthcare and social assistance employment in the states occurred in 2009, as retail trade, manufacturing, and other industries showed declines with the onset of the most recent recession." Health care surpassed manufacturing in number of jobs in 2004.
To see how top industries have changed by year, take a look at this post from the BLS.