It's True, They All Look Alike (anyone of a race different from yours)

Studies have found that people have trouble recognizing the faces of people of a different race.  This is referred to as Own-Ethnicity Bias.   In addition to better recognizing people of their own ethnicity, groups also showed bias in their ability to recognize people of certain other races.  Hispanics were able to recognize Caucasian faces better than Black or Asian faces.  Blacks recognized Caucasian faces better than Asian or Hispanic faces.  Asians and Caucasians had more difficulty recognizing the faces of races other than their own.  So the next time someone says "they all look the same", it's kinda true.

Articles:

http://www.britannica.com/bps/additionalcontent/18/39453174/OwnEthnicity-Bias-in-the-Recognition-of-Black-East-Asian-Hispanic-and-White-Faces

http://www.psyarticles.com/perception/race-face.htm