The correct answer to this open question is the following.
Although there are options attached, we can say the following.
We are talking about the 13th Amendment to the United States Constitution.
The basic idea of the 13th Amendment was that slavery was illegal in the United States territory. It was ratified on January 31, 1865, and finally abolished slavery in the country.
However, the Black Codes in the southern states still restricted African American civil rights in the South. White people in the southern states did not accept the idea of black having rights. That is why the US Congress passed the Civil Rights Act of 1866 to invalidate the Black Codes.
