Answer: B. The passage of Black Codes throughout the South.
Step-by-step explanation:
The Black Codes (1865-1866) were laws that replaced the former slave codes after the American Civil War. They aimed to force African Americans to work for extremely low pay or to get into debt.
Black Codes were considered as a return to slavery, and, therefore, transgressing the Thirteenth Amendment, so the Fourteenth Amendment was enacted, as well as the Civil Rights Act of 1866, and the Second Freedmen's Bureau Bill.