They had school for a whole month. It would be interesting to see what other assignments the class was given and then put things into context before jumping to judgment. Keep in mind these kids are in Kindergarten as well. The teacher perhaps or whoever came up with this idea was probably just trying to come up with something a little fun for the age group, or perhaps may have been guilty of being a little lazy.
Not every kindergarten assignment has to be an earthmoving revelation in history.
No, I can't see how that is normal non-racist behavior.
Only context needed here, is to reveal if the kids had studied any important White Americans at anytime during the school year so far.
If they had?
Then that means racist faculty were fully aware that the students could process info/learn info, about important American human beings specifically for BHM.