Teachers and friendship study

Students learning in classrooms in which they perceive teachers as warm, respectful and trustworthy may be more likely to form and continue interracial friendships, according to a recent study.What’s more, students’ perceptions of their teachers—who may treat children in the same class differently, for example—influenced the rate of growth in same-race friendships from the fall to the spring. "When teachers [show] that everyone is valued ... that everyone deserves warmth and support, then that trickles down to the students, particularly at this age," said  the study's lead author.
Cappella, E.(2016). When black and white children grow apart. Atlantic (June 14). 
http://www.theatlantic.com/education/archive/2016/06/interracial-friendships-fade/486902/