The effect of black codes is that, white southerners enacted a series of restrictive laws designed to restrict freedom for former slaves activities and ensure their availability as a labor force now that slavery had been abolished; for instance, many states required blacks to sign yearly labor contracts; if they refused, they risked being arrested as vagrants and fined or forced into unpaid labor.
The Nadir is often referred to as the period after Reconstruction or from 1890-1920, Literally meaning "the lowest point" or "the time of greatest depression for African Americans while freed people refers to the former slaves after passage of the 13th Amendment and the end of the Civil War.
Sharecropping system embraced most of the South's African American and white poor, a landowner dictated the crop and provided the sharecropper with a place to live, as well as seeds and tools, in return for a "share" of the harvested crop.
The landowner often bought supplies on credit, at very high interest, from a supplier, the landlord passed on theses cost to the sharecropper, sharecroppers were perpetually in debt to the landowner, and the landowner became in debt to the supplier; for the sharecropper this created a kind of debt peonage or bondage.
Debt peonage under the sharecropper system, is creation of a type of bondage by the sharecropper to the landowner; thus the sharecropper could never move because they always owed the owner the labor of next year's crop.
Therefore, the entire concepts are similar. The correct answer is as given above
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