Final answer:
The 1862 Mankato Executions were a turning point in the history of slavery in the United States as it marked a series of hangings that took place in Minnesota after the U.S.-Dakota War of 1862.
Step-by-step explanation:
The 1862 Mankato Executions were a turning point in the history of slavery in the United States. Option b is the correct answer. The 1862 Mankato Executions were a series of hangings that took place in Minnesota after the U.S.-Dakota War of 1862. Thirty-eight Dakota Native Americans were executed for their involvement in the conflict. This event marked one of the largest mass executions in U.S. history and had significant implications for the treatment of Native Americans and the future of slavery in the country.