What did Helen hunt Jackson mean by Dark Stain?

Helen Hunt Jackson used the phrase "Dark Stain" to refer to the mistreatment of Native Americans by the United States government. In her 1881 book "A Century of Dishonor", Jackson detailed the history of broken treaties, forced removals, and other injustices that Native Americans had endured at the hands of white settlers and the US government. She argued that these actions amounted to a "dark stain" on the nation's history.

Jackson's use of the phrase "Dark Stain" was intended to shock and arouse the conscience of her readers. She wanted to make it clear that the treatment of Native Americans was not just unfortunate but morally repugnant. By using such strong language, Jackson hoped to inspire others to join her in calling for justice for Native Americans.