Answer: Historically, the ”LEFT HEMISPHERE” was seen as the dominant "HEMISPHERE" of the brain.
Step-by-step explanation:
The left hemisphere of the brain controls the right side of the body including the right part of the brain. If you consider the structure of brain, you see that the right side of the brain deals with analytic thought, reasoning, logic, language, science, maths, writing and number skills which are needed in our day to day activities.
The right hemisphere on the other hand controls the left side of the body which deals with art including music and creativity.