What im gonna answer with this is there a question?
The answer is population.
Small states wanted everyone to have equal representation no matter what the size or population. Large states wanted representation based on population. As a result they came up with the Great Compromise which is how we have the House of Representatives and the Senate today. The House's number of representatives are based off of a states' population and the Senate has 2 representatives in every state.
The answer is characterization. It is the representation of persons in narrative and dramatic works of art. Characters in action is what makes plot. This is also related to character motivation. By doing motivation, it creates a more powerful story.