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In page Model minority:

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One possible cause of the higher performance of Asian Americans as a group is that they represent a small population in America so those who are chosen to move to America often come from a selective group of Asians. The relative difficulty of emigrating and immigrating into the United States has created a selective nature of the process with the U.S. often choosing the wealthier and more highly educated out of those with less resources, motivation or ability to immigrate.[1][2]