Write an introduction paragraph for your outline. use the same thesis statement in your outline. here my outline illegal immigration: the cause of overpopulation in the united states what attracts the citizens of other countries to migrate to the u. s.? whether it is the stable economy, the safe environment or the lifestyle, the overpopulation problem creates a problem in the population capacity of the country. the problems that overpopulation carry is an increase of energy usage, urban crowing, decline in water availability, agriculture interruptions due to suburban development and a direct effect in nature and species. how is our economy affected? lack of education and poor human resources tend to bring a number of issues, like crime, poverty and less job opportunities. contrary to what it is believed, the growing of population does not mean that demand will actually grow faster than supply.