In the 1800s, many african americans underwent religious conversions at

The answer is: Methodist and Baptist revivals.

At that time, the The Methodist and Baptist revivals was openly known for their progressive advocacy. They are known for their pro abolishment view and they advocate for fair treatment of African Americans at that time period. African Americans saw them as their ally. This is why many of them underwent religious conversion at these place.

probably 3 since archeologists and historians don’t understand there writing.

answer; biological;