Which practice sometimes led to a tenant farmer being treated like a slave ?

Sharecropping

Explanation:

After the end of slavery, former slaves needed land that they could cultivate and that would fulfill their basic needs. However, most of them could not own a farm. Therefore, a system known as sharecropping was developed. Former slaves became tenants, and a small tract of land was assigned to them. In theory, a tenant farmer could eventually become a land owner. However, many tenants instead became more and more indebted due to crop failures, low cotton prices, poor management, etc. This could leave them in a situation that was not any different from slavery.

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