Help finding a book, can’t remember it.

So I remember reading a book about 10 years or so ago and I cannot recall its title for the life of me. What I remember is this: It is set on a different planet where slavery is reversed-black people enslaved white people.
Most of the book from what I remember is set around a woman’s pov, with her having knowledge she shouldn’t for her place such as reading, writing and math.
During the book she gets pregnant and this helps fuel her desire to flee, and there was a battle in a gorge or canyon or something where they were trying to escape in a smugglers wagon or something and they get ambushed from above. I remember that it is slightly religious in a way, as the black community was using a warped version of Christianity to justify their actions as well as their own past as slaves on Earth.
It is set in a future timeline but since they crashed on a planet their current technology was equivalent to around 1900s, with some minor advances on specific things. I dont recall the name of the book or the author, and my version was a paperback with a image of a earth-like planet picture taken from space, but it was not earth as it was a super continent or something similar.
I hope you guys have suggestions or questions that can help me remember, and if you think you know it let me know and I’ll check it out and read it to see it it is the one. 🙏