I don't think one 30 minute speech is going to affect any vaguely normal kids. I would consider the typical grade school or high school history book more propagandistic than that.
I remember one of my history books from about 6th grade. On the cover was this long line of people receding to the horizon in the background. Near the front was this "BRAVE" American pioneer. Of course EVERYBODY in this line was White. I remember staring at the cover of that book for a long time. It comes across like thae only people on tha planet that matter are the White ones. So all of the White people bitching about Obama's speech are just advertising how full of crap they are as far as I am concerned.