Population distribution in United states is extremely variable.
Most of the people are living in mega-cities like New York, Los Angeles, and Chicago because of the economic development, better education, jobs and health facilities. More consumption of resources, air population and noise population in these areas are causing environmental degradation.
Promoting economic growth and creating more jobs in countryside can help an even population distribution. Providing equal education and health facilities in less populated areas will help us to save the environment.