There is no history of mankind, there is only an indefinite number of histories of all kinds of aspects of human life.
Karl PopperPsychologism is, I believe, correct only in so far as it insists upon what may be called 'methodological individualism' as opposed to 'methodological collectivism'; it rightly insists that the 'behaviour' and the 'actions' of collectives, such as states or social groups, must be reduced to the behaviour and to the actions of human individuals. But the belief that the choice of such an individualist method implies the choice of a psychological method is mistaken.
Karl PopperThere is no history of mankind, there are only many histories of all kinds of aspects of human life. And one of these is the history of political power. This is elevated into the history of the world.
Karl PopperThe only way to test a hypothesis is to look for all the information that disagrees with it.
Karl Popper