There are numerous ways this can go, but here is the basic framework....
Opening scene is soon after the American Revolution when slavery was commonplace in the northern states as well and is portrayed as a branch to a different timeline. The scene is after dark and attempts to realistically portray the gritty harshness of slavery. Some slaves escape and capture their owners and sneak to the neighboring plantation and release the slaves there, capturing their owners, and they continue on. The scene closes.
The next scene is modern times and shows a form of festival. Everyone shown is Black and Native American, and the festival includes rituals that are a hybrid blend of various African (mo