""The Twofold Slavery of the United States: With a Project of Self-Emancipation"" is a book written by Marshall Hall that explores the issue of slavery in the United States. The book delves into the two forms of slavery that existed in the country at the time: the enslavement of African Americans and the subjugation of women. Hall argues that both forms of slavery are interconnected and that the fight for freedom must include the liberation of both...