They were marched into the classroom, single file, and lined up along the blackboard to face the roomful of white faces. It would be sheerest invention to say I remember everything about that day. The only things I recall had to do with questions about how my own situation was about to change. Thinking back, though, I can recall, without remembering a single one of their names, a general tension transmitted between the two groups. Groups clearly being treated as groups. And the expressions I saw were not the excited faces of new students but the suspicious faces of new problems.…