Original sentence: In 18th century America and Europe, it was commonly assumed that Cain's "mark" was black skin, and that Cain's descendants were black and still under Cain's curse (The majority of Cain's descendants were killed in the great flood, but Latter Day Saints' from the late 19th to mid 20th century believed that Cain's bloodline was preserved on the ark through Egyptus
Edited sentence: In 18th century America and Europe, it was commonly assumed that Cain's "mark" was black skin, and that Cain's descendants were black and still under Cain's curse (the majority of Cain's descendants were killed in the great flood, but Latter Day Saints from the late 19th to mid 20th century believed that Cain's bloodline was preserved on the ark through Egyptus