The Unassigned Lands were a byproduct of treaties with the __________ tribes in the year __________.

After the Civil War, treaties made in 1866 with the Creek and Seminole tribes required them to cede lands to the United States. Some of this land was not assigned to another tribe, so it became known as the Unassigned Lands. Therefore, the correct choice is “Creek and Seminole . . . 1866.”

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