NCATE and most teacher preparation institutions include "diversity" as a necessary component of pre-service training. But in looking at how these are implemented - through casual conversations, hence the request for reserach :) - these tend to simply teach about cultural differences.
In other words, they seem to define "Native Americans", "LGBT Americans", "African Americans" and other minorities by their skin color or sexual orientation and recommend strategies for dealing with this.
My interest is if these promote positive affects on student learning or if they create a negative externality where teacher candidates engage in implicit racism (such as: I have a Native student so I need to use cooperative learning for him, e.g. - defining him by his race)