LOL. Professor, you have overlooked what is obviously the key factor -- competent governance, sane fiscal policy, and low taxes. Either you are a complete dolt educated beyond your intelligence or you are a die-hard lefty who refuses to face simple, irrefutable facts. People and capital gravitate toward states and nations with good governance and low taxes. The outlier on the destination "states" is Washington DC where fedgov is adding 100 parasites per day to its payroll. Without fedgov and air conditioning, Washington DC is a miserable place to live and work. To call Washington DC a "growing economy" is an insult to all working Americans who believe in limited government.
And the sad part about the Northeasterners moving into North and South Carolina is that they start trying to change the states into the liberal hell-holes they moved to escape!