gvbest,
The teacher is right. History is written by the conquerers. How long were we taught that Columbus discovered America?
All he did was navigate wrong and ran into a place already occupied. Now he has a holiday set aside for him.
Also, I applaud you as a parent that stays in touch with what is being taught their kids, but don't take everything taught as the ultimate truth. Text books are picked out by people with their own agendas.