The impartiality of a historian can only show that he is very rigorous in his study of history and will not arbitrarily impose his own speculation on historical events;

The objectivity of history is determined by the characteristics of history itself, because history is the development of people and things in the past. However, we can't go back in time, so we can't verify the authenticity of history. In a sense, no one can assert history, even if the evidence is sufficient.