The Center for Immigration Studies has released a new report called "A State Transformed: Immigration and the New California" (link). To summarize, we're basically turning into Brazil:

Between 1970 and 2008 the share of California’s population comprised of immigrants (legal and illegal) tripled, growing from 9 percent to 27 percent... As a result of immigration, however, by 2008 California had the least-educated labor force in the nation in terms of the share its workers without a high school education...

* In 1970, California had the 7th most educated work force of the 50 states in terms of the share of its workers who had completed high school. By 2008 it ranked 50th, making it the least educated state...

* Education in California has declined relative to other states. The percentage of Californians who have completed high school has increased since 1970; however, all other states made much more progress in improving their education levels; as a result, California has fallen behind the rest of the country...

* The large relative decline in education in California is a direct result of immigration. Without immigrants, the share of California’s labor force that has completed high school would be above the national average...

* ...California’s income distribution in 2008 was more unequal than was Mississippi’s in 1970...

More at the link.