Forty-five years after New Jersey's manufacturing industry began its decline, as companies started moving their factories to the South, there are signs that the state's corporate sector may be going the same route. Tuesday's announcement by Mercedes-Benz USA that it plans to move its corporate headquarters from Montvale to metro Atlanta followed similar announcements in the last 18 months by Hertz of Park Ridge, which moved to Florida's Gulf Coast, and Sealed Air of Elmwood Park, which is moving to Charlotte, N.C. So now three Fortune 500 companies, along with nearly 2,000 jobs, are moving or have moved to Southern locations that years ago would likely not even have been considered by corporate executives.