"one of the millions trying to get in..."
That is one of the major problems--population explosion. Our nation currently has the world's third highest population (behind India and China and ahead of Pakistan--great company to be in). If the population continues to increase and explode, the quality of life in the nation will have to decrease simply because there will be fewer resources available per capita, which means higher prices for those resources in addition to increased pollution and environmental destruction.
Combine that with our economic problems (transforming into a third world country where a small percentage of the people will be very rich and almost all the rest lower class), it's a time bomb waiting to go off.
In the meantime, our politicians are completely unaware of the population issue and either do not recognize the economic problems or have no intention to fix them (probably because they are personally benefiting).
http://www.youtube.com/watch?v=FM1YU-Ni_84