What do scientist add to the study of history

Political rights for women grew most rapidly on the western frontier primarily because (1) the settlers were influenced by native american indian societies (2) women greatly outnumbered men in the west (3) pioneer life often required men and women to share responsibilities equally (4) immigrants settling in the west brought ideals of gender equality from europe

Which piece of information would most a historian create an interpretation of this photograph of works in a factory?

Over time, who did the nature of slavery change in america