Here's the thing, I agree with you na hindi lang iisang sangay ang history kasi meron tayong tinatawag na historians na nagfofocus sa history ng particular place. EG, Asia. Europe, etc. at ng isang partikular na sibilisasyon. EG. Sumerian, Egyptian, American, etc. at ng isang partikular na tema, EG. Chemical Science, Biology, Anthropology, etc. pero the thing here is that "lahat" sila ay based on facts proven by numerous evidences backed by recognized institution. And also mababaw ang "legitimacy" ng mga "pseudo-historians" na tinutukoy ko kasi their theories are more of conspiracy. Also, this historians have some degree and recognition from legitimate institutions.
I apologize kung naging vague yung caption ko.