User: What are the causes of population growth in the Sun Belt in the US?
Assistant: Since WWII, many people have migrated from the US Midwest or Northeast to the Sun Belt. One significant factor is the milder climate and the recreational possibilities it makes possible. Economic opportunity is another factor, as many automobile and other manufacturers have left the Midwest and Northeast and built factories in the Sun Belt. The housing stock is newer and affordable, which attracts people of all ages.