Largest industries by state, 1990–2013

"In 1990, the manufacturing industry was the leading employer in most U.S. states, followed by retail trade. In 2003, retail trade was the leading employer in a majority of states. By 2013, health care and social assistance was the dominant industry in 34 states. This animated map shows the top industry in each state and the District of Columbia from 1990 to 2013..."
Industries by state