Why do many mexicans move to the u. s?

Recent reports by the Pew Research Center (February 2012) indicate that the current migratory influx from Mexico to the U.S. is just below a net zero, as more Mexicans leave the U.S. Economic problems are, overall, the little stability of Mexican peso exchange rate compared to the United States dollar. Because of this, many Mexicans choose to leave their native country and look for better economic opportunities in the United States, and send dollars to their families in Mexico. For some, this is only a temporary stay in America while working. However, many others choose to permanently reside in the U.S. with their families.