The change in the South during Reconstruction that most likely resulted in the rise of organizations such as the Ku Klux Klan was:
Many southern states passed Black Codes.
Black Codes were laws enacted in the South to restrict the freedom and rights of African Americans, and they were a reactionary measure to the progress that African Americans had made during Reconstruction. The formation of groups like the Ku Klux Klan was driven by a desire to maintain white supremacy and to oppose the increasing rights and social status of African Americans following the Civil War.
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