Indeed, when history is given as a separate subject, one expects to be presented with the facts, rather than with the biased views of a party such as the Government that has a strong interest in what is presented as the truth. Many historians themselves have given up the search for the truth, for what really happened in the past. They have come to the conclusion that facts are inevitably presented in a biased way. Not so schoolteachers, they claim to have a monopoly on the truth. Teachers claim that they are presenting children with the facts and nothing but the facts.
Textbooks describing historical events usually claim to give the bare, objective facts.
And this is exactly what is wrong with it. The point is that it is quite irrelevant that the Battle of Waterloo took place in 1815. Today, we can still see the legacy of 'Napoleon', as people are forced to register births with the Government, use family names, use the metric system, etc. School portrays history as a chain of events in which people are butchered to death. Out of a whole century, history books typically pick only those events in which large numbers of people were slaughtered, died of epidemics, were led into captivity or were starved to death.