It's probably true here, also. Certainly most younger children wouldn't recognize political bias in their teachers. Perhaps some high school kids might if they had an interest in politics. If a young person notices bias in their teachers at all, it's usually not until late high school or in college.
Hi ya, There are exceptions but by and large teachers
are liberal to far left. Also their union is way left
and fund and support liberals who run for office.
In the early 1960s when I was finishing school, all my
teachers were very liberal except for a few who happened
to be WWII vets.
It made no difference the subject. I was down graded
because I wouldn't go along with the everything from
pro Castro to pro unions, pro democrat prezs, etc.
ie. in English had to do an autobiography bookreport.
At that time Gen. Douglas MacArthur's book had come out.
Admire him and did a report, wooo, major notes all over
the report on was a terrible person he was , etc.