Which former slave became an adviser to the president and spoke out on behalf of poor people-white and black-and for the rights of women, Chinese immigrants, and Native Americans?

The answer is Frederick Douglas. He was born a slave but later learned to read and write. He escaped slavery and joined the Abolitionist Movement to preach against the system of slavery. He later became a writer and newspaper editor. He was an adviser to President Lincoln. Douglas is proof that slaves had intelligence and talent that slave owners put down.