What is a short summary of Parts II and III of the nonfiction book, The Warmth of Other Suns?

Part Two, “Beginnings” provides a more in-depth look at the lives of the three principles with anecdotes about the suffering of other blacks and blacks in general in the South. The events and incidents that compelled these people to flee the South are described. In Part Three, “Exodus” the details of the migration effort are covered.