The post-Civil War era hardship is depicted in the diagram is Sharecropping.
What is Sharecropping?
Due to the hardship of the post-civil war period, a lot of former slaves went looking for jobs. On the other hand, landowners who were farmers were also looking for farm laborers.
Because there was no money system or cash for exchange, Sharecropping was invented. This refers to a system where the landowner allows the farmer to plant on their land in exchange for a percentage of the crops harvested.
Hence, the correct answer is D.
Learn more about Sharecropping at;
https://brainly.com/question/881028
