Final answer:
Frederick Douglass's overall message in his speeches was about the cruelty and injustice of slavery, the need for its abolition, and the promotion of equal rights and freedom for all.
Step-by-step explanation:
In his speeches, Frederick Douglass conveyed a powerful overall message about the cruelty and injustice of slavery and the need for its abolition. He emphasized the inhuman and degrading treatment endured by enslaved people and the urgent need for equal rights and freedom for all. Douglass's speeches aimed to awaken the conscience of his listeners, challenge the prevailing beliefs and practices of his time, and inspire action to bring about social change.