It would be helpful if you provided specifics such as years, countries, etc..unless your intent is to acquire individual / anecdotal opinions.
Additionally, if your study is slanted towards the impact of immigration (overall) to the State of California before and/or after the passage of the silly health bill and adaptation of the Cap and Trade grab bag ordinance; then I bid you good luck. Redline everything and everywhere.
What was once a dire situation in California before is now a
nightmare in progress neatly titled
"Si Se Puede" (Patended). Loosely translated: '
A nightmare for you, A fiesta for us'.
Of course, historically, one can be aided by reading
this bit of information, too.
FWIW, Easter European immigrants, along with Indians, Filipinos, and Middle-Eastern folks are the fastest group of homeowners in California the past 2-3 years.