The fact that the United States was reunited as a single country after reconstruction made it successful.
Following the American Civil War, a period known as Reconstruction was when efforts were made to address the political, social, and economic legacies of slavery as well as the issues brought on by the readmission of the Confederate States to the Union.
Reconstruction was successful in this instance because it allowed the United States to regain its unity. All of the former Confederate states in this instance had written new constitutions, ratified the Thirteenth and Fifteenth Amendments, and swore allegiance to the United States.
African Americans were able to obtain full civil rights thanks to reconstruction in the 20th century. As a result, it was successful.
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