Answer:
The fundamental reason was that slavery was not at first generally seen as immoral or otherwise wrong; that is, it was generally accepted to be natural or legitimate, and it would continue to be seen this way for many generations before a different view would become influential.
Mary's behavior exhibits imaginary audience. The imaginary audience alludes to an egocentric state where an individual envisions and trusts that huge numbers of individuals are energetically tuning in to or watching him or her. In spite of the fact that this state is frequently displayed in youthful puberty, individuals of all ages may harbor a dream of a nonexistent gathering of people.
The Monarch was the supreme ruler. Ladies were high ranked nobles, but not rulers, while Serfs were almost the same as peasants.