Most likely they knew because they got pretty ill and maybe tried to find their way of curing their people.
Answer:
Full of endless, backbreaking work
Explanation:
Sarah Gudger was a former slave for about fifty years before she gained her freedom after the end of the American civil war.
During her interview with Marjorie Jones in 1937, she described her ordeal and time as a slave at the Swannanoa Valley, she explained how slaves were treated at the hands of their slave masters in her word the experience was full of "Full of endless, backbreaking work."
He was convinced that the war was part of a democratic scheme to add more slave states to the union
Affects it because they are joining together