While you discovered the dreary reality of Detroit, Michigan—that's only one American city! Commensurately—Miami, Chicago, Houston, New York, Los Angeles and others follow toward a range of similar futures.
Ask yourself, with 15 million Americans unemployed and 35 million subsisting on food stamps, does it make sense to import 160,000 legal immigrants into this country every 30 days and a total of 1.5 million plus annually? Especially when those immigrants cost American taxpayers (you) a total of $346 billion in resettling services across 15 federal agencies annually?
At this point in time, with 10 million legal and unlawful immigrants, California suffers a $24 billion debt. It cannot pay its bills. It sinks deeper into collapse as it adds 1,700 people per day, every day of the year.
Next question: what if all of our states turned into Californias? Given enough time, they will! Remember that U.S. population projections show immigration adding 100 million people to the USA in 26 years. (Source: Fogel/Martin March 2006, "US Population Projections", www.fairus.org)