During the High Middle Ages in Europe, thousands of trees were cleared to make way for agriculture and create new fields for farming. Agriculture was impossible with their dense woodland, so they need to clear it — giving way to a new type of livelihood.
The souths whole business and income were build on slaves. Taking slaves out would make the south go deep in debt so much that they would still be in debt to this day and they still are.
Answer: a peaceful, gradual one that focuses on passing laws and winning cases in court, or a radical one that includes direct action and acts of civil disobedience.