Answer:
The correct answer is: overused water resources.
Explanation:
According to reports, especially in the newspapers, like the New York Times, since the 1970´s, onwards, especially the 1980´s and 1990´s, the famous Sun Belt, all the states that make part of what is known as the sunnier and warmer side of the U.S, experienced two situations: migration explotion and inequality in growth, development and opportunities, when compared to other regions of the country, like the Northeast and the West, which had been for a time been replaced by the Sun Belt as the more attractive and opportunity-rich regions in the country. However, what has been seen is that this migration explotion did not come with constant and balanced development throughout the Sun Belt and some states and subregions have lagged behind, in part, because of the resources that are being used by the increasing population, including the water resources. This has also led to some of these subregions to be taken as some of the most poor, and are lagging behind other northern and western states as sources of opportunity for migrants.