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Third variables are not adequately controlled when random assignment fails to create equivalent groups.
Black Codes
Laws passed in the Southern states after the Civil War, aimed at restricting African Americans' freedom and compelling them to work in a labor economy based on low wages or debt.
Positions of Servility
Statuses or roles characterized by an excessive willingness to serve or please others, often at one's own expense.
Southern Society
Refers to the cultural, economic, and social practices distinctive to the American South.
Andrew Johnson
The 17th President of the United States (1865-1869) who assumed office after the assassination of Abraham Lincoln and was the first president to be impeached, largely due to his lenient policies towards the Southern states after the Civil War.
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