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<p>How about going to a school where you are a member of a minority group? By default, most of the students you meet in class, in dorms, etc. will be members of other groups.</p>
<p>If you are white and want to meet people of other ethnic groups, consider the following, among others:</p>
<p>California Institute of Technology
Howard University
New Mexico State University
San Jose State University
University of California, Irvine (or any UC except Santa Barbara and Santa Cruz)
University of Hawaii
University of Texas, El Paso</p>