The united states received a significant influx of immigrants from between 2004 and 2010.

I believe the answer is: Australia 

The most likely cause of the influx is the signs of economic recovery that united states made from the economic crash that happened on 2001 and 2008.

(the recovery from the dot com bubble that crashed in 2001 began in 2004 and the recovery from the housing bubble that crashed in 2007 began in 2008)

answer; /// the above statement is (false);