The correct answer to this open question is the following.
Imperialism is shown in the Hierarchy of Scale techniques because it shows the superiority of the people depicted in the paintings.
First, we have to remember that the Hierarchy of Action is a technique used by artists to paint a character with exaggerated disproportion to create the impression of superiority. That is why imperialistic topics and representation oftentimes shown the Hierarchy of Scale, to transmit the idea of domination and superiority over the conquered lands.