A new analysis of Census data tends to rebuke the common misconception that almost all foreign nationals who immigrant to the United States are low earning blue collar workers. Instead, the data shows that are rather large portion of immigrants to the United States are highly-educated white collar workers. What is more, those cities that tend to have thriving immigrant populations (of both blue and white collar workers) tend to be those cities that prosper the most.
For a more complete overview of the data, visit the New York Times article about the data.