I stopped counting at 150. Pete Souza and the White House Photo Office have created an inside look at the Obama White House that is well worth a look. See it here.
The following images are of members of opposing groups who are consistently killing each other, displacing each other, maiming each other, terrorizing each other. These are just a small selection of pairs. Your task if you choose to accept it is to identify the ethnic (hated) identity from the photo and to ask the questions of yourself and others of what comes from such an exercise. The pairings are Russian-Chechen, Kurd-Turk, Palestinian-Israeli, Sunni-Shiite. The photos are in no particular order. You can check the identities by mousing over the photo for the url.