The quality of one's life in a country is based on their economic infrastructure, not population. Their economy is developed in proportion to the increase in population. This concept is similar to the supply and demand concept, and if American can't develop an economy designed to meet their population’s needs, then their doing something wrong.
Jobs are scares in the United States, and even college graduates find it difficult to obtain a job out of school. This is also why the middle-class is slowly disappearing in the US, because the rich keep getting richer, and the poor keep on getting poorer. In the end, the Microsoft’s, chevrons, war-profiteers, and the corporations will control a large portion of the nations wealth, and the average Joe's of the US will be left to suffer. These monopolies’s are slowly taking over the nation, and the politicians stand and watch because their dirty money and corrupt minds keep them quiet.