Source: https://www.splcenter.org/sites/default/files/tt_hard_history_american_slavery.pdf
Author: Southern Poverty Law Center, 2018
Results:
8% of U.S. high school seniors could identify slavery as the central cause of the Civil War.
68% of the surveyed students did not know that slavery formally ended only with an amendment to the Constitution.
22% of students could correctly identify how provisions in the Constitution gave advantages to slaveholders.
44% of students answered that slavery was legal in all colonies during the American Revolution.