"Asians have surpassed Hispanics as the largest wave of new immigrants to the United States, pushing the population of Asian descent to a record 18.2 million and helping to make Asians the fastest-growing racial group in the country, according to a study released Tuesday..."

Source - http://www.nytimes.com/2012/06/19/us/asians-surpass-hispanics-as-biggest-immigrant-wave.html