From the Washington Center for Equitable Growth, which notes:
Of all the indicators describing the not-very-impressive U.S. economic performance of the first decade-and-a-half of the 21st century the least impressive is probably median household income. It hit an all-time high in 1999 of $57,843 (converted into 2014 dollars), and as of 2014 stood at $53,657–a 7.2 percent decline…. The typical American household remains poorer than it was 16 years ago.
The states that have struggled the most tend to have manufacturing-intensive economies (Delaware and Nevada are the exceptions). Also, it’s worth pondering for a moment just how bad things have been in some of these states. The typical household in Michigan and Mississippi was more than 20 percent poorer in 2014 than in 1999. And Mississippi, which had the fifth-lowest median income in 1999, was dead last in 2014, with a median household income ($35,521) less than half that of Maryland, the most-affluent state.