Actually, Historiography is about trying to make sense of the past, that it used to push an agenda is merely a by-product of human nature. Nor are you correct to say that all history attempts to show the historian's own side as positive. Two examples of the latter pitch are German history of the Second World War and the British history of Colonialism. Any history has a bias, because any person has a bias, but Historiography is not about pushing a particular viewpoint above all else.
True to an extent, but your English colleague clearly didn't pay attention in his history classes, as such a perverse view has never been taught in English schools. The closest you might come to that in the English educational system is the Churchillian cult of "We Won the War" in the 1950's during the post-Imperial period.History taught in Classrooms is more construction of Identity with Role Model and Heroes than real history.
I have an English Colleague who can with a strait face tell me that England was never defeated. When I do answer that is why Philadelphia is still English, he just avoid answering
Generally speaking, history is a perspective of the past constrained within the available facts.
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