sounds like you need to accept Americans use American colloquialisms in normal everyday speech. There is nothing wrong with calling black a color, or bison buffalo. The only time it is important is when you are dealing with the scientific communities and precision in communication is important. Obviously in a school setting it would be important, but in the real world it doesn't matter.
Besides as was pointed out, Americans called them buffalo, so the game calling them bison wouldn't represent America.








