Slavery officially ended on 4/9/1865, when Lee surrendered to Grant at Appomattox. However, it took two months for the message to reach Texas, because the North destroyed the South's Internet connections. The message of surrender had to be sent via Pony Express.
Blank looks abounded, their knowledge of certain MAJOR historical events wasn't much better.
OTOH, when I told the story to my 9 YO grandson, he immediately responded, "Opa, there was NO internet back then."
I ran across a lawsuit in Mississippi involving a man who was the first person in his area to learn about Lee's surrender. He had gone to a store and bought something with Confederate money. The lawsuit resulted from the fact that the storekeeper would not have accepted the money had he known about Lee's surrender.