It decreased the number of slaves making items out of cotton but never decreased how many were in the fields
<span>Passed by Congress on January 31, 1865, and ratified on December 6, 1865, the 13th amendment abolished slavery in the United States and provides that "Neither slavery nor involuntary servitude, except as a punishment for crime whereof the party shall have been duly convicted, shall exist within the United States</span>
I don't know the answer but try reading this:
https://www.history.com/topics/1960s/robert-f-kennedy
It should help give you information.
Good Luck!!