The correct answer to this open question is the following.
Although the question is incomplete because it does not refer to a specific moment or place in the history of the US, we can say that if it refers to President Abraham Lincoln's Emancipation Proclamation of 1863, then his new freedom was 'inconceivable" to African Americans in the southern states until the Union Army won the American Civil War in 1865. However, although the ratification of the 13th Amendment to the Constitution of the United States happened in December 1865, the road to freedom for African Americans in the south was long to come. During Reconstruction, Jim Crow Laws and the Black Codes were southern legislations that limited freedom and the civil rights of Black people.
Many former slaves still were unedumercated and needed to find jobs this lead to a legal form of work known as share cropping (tending to crops for a portion of the crop or a low wage pay)
Is this like my opinion or?
A. 1967/1968
The other answers weren't even during the time of the Vietnam Conflict, whereas Option A even coincides with protests close to Kent State in 1970.
Harding saw his administration marred by scandals in the 1920s