25. Explain the impact that the end of the Trans-Atlantic slave trade had on US? What were the important elements of slave culture? What did slaves do to aggravate their owners? How did slave owners justify the morality of slavery? In what two ways did slave owners organize slave labor and how did slaves react to the systems? What was it like for free African-Americans who lived in the North? Why were Denmark Vesey and Gabriel Prosser unsuccessful in their slave rebellions?