The 1740s to the 1830s. As the slave population reproduces, American planters become less dependent on the African slave trade. Ensuing generations of slaves develop a unique culture that blends elements of African and American life. African Americans, including Thomas Jefferson's slave Jupiter, Colonel Tye, Elizabeth Freeman, David Walker, and Maria Stewart, respond to the increasingly restrictive system of slavery. The Revolutionary War reveals the contradictions of a nation seeking independence while simultaneously denying freedom to its black citizens.