According to a new study, migration from northern states to the Sun Belt has slowed in the past few years, putting a break on the population growth that has driven the region’s relatively strong economic performance. USA Today reports : Net population gains from Americans moving to Arizona, Nevada and Florida from other states have been largely wiped out, according to migration data from the IRS. “This recession has been a sobering experience for Americans when it comes to migration,” says Kenneth Johnson, demographer at the University of New Hampshire’s Carsey Institute who analyzed the data.