Answer:
Similar problems, race and goals.
Step-by-step explanation:
Similar problems, race and goal are the factors that formed a sense of self-worth and community possible because all the slaves experience same attitude and difficulties. They formed a community in order to be united and get rid of slavery and difficult life.
The life of slaves are very hard, painful and full of difficulties so that's why they established a sense of self -worth and community to solve their problems.