The evidence provided to support the assertion of why a race based slavery system was developed was that wealthy English people feared a revolt from the English poor and used slavery to avoid it.
The wealthy English people in the colonies were worried of an internal revolt from the poorer English people and so they came up with a race based slavery system.
The purpose of this was to placate the poorer English colonists by making them aware that they were higher on the social ladder than enslaved people because they as English people, were of a superior race.
Find out more on the origins of slavery at https://brainly.com/question/432565.